Large Number Names & -illion Bases
| Base -illion (short scale) | Base -illion (long scale) | Value | US, Canada and modern British (short scale) | Traditional British (long scale) | Traditional European (Peletier) (long scale) | SI Symbol | SI Prefix |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 106 | Million | Million | Million | M | Mega- |
| 2 | 1 | 109 | Billion | Thousand million | Milliard | G | Giga- |
| 3 | 2 | 1012 | Trillion | Billion | Billion | T | Tera- |
| 4 | 2 | 1015 | Quadrillion | Thousand billion | Billiard | P | Peta- |
| 5 | 3 | 1018 | Quintillion | Trillion | Trillion | E | Exa- |
| 6 | 3 | 1021 | Sextillion | Thousand trillion | Trilliard | Z | Zetta- |
| 7 | 4 | 1024 | Septillion | Quadrillion | Quadrillion | Y | Yotta- |
| 8 | 4 | 1027 | Octillion | Thousand quadrillion | Quadrilliard | R | Ronna- |
| 9 | 5 | 1030 | Nonillion | Quintillion | Quintillion | Q | Quetta- |
| 10 | 5 | 1033 | Decillion | Thousand quintillion | Quintilliard | ||
| 11 | 6 | 1036 | Undecillion | Sextillion | Sextillion | ||
| 12 | 6 | 1039 | Duodecillion | Thousand sextillion | Sextilliard | ||
| 13 | 7 | 1042 | Tredecillion | Septillion | Septillion | ||
| 14 | 7 | 1045 | Quattuordecillion | Thousand septillion | Septilliard | ||
| 15 | 8 | 1048 | Quindecillion | Octillion | Octillion | ||
| 16 | 8 | 1051 | Sedecillion | Thousand octillion | Octilliard | ||
| 17 | 9 | 1054 | Septendecillion | Nonillion | Nonillion | ||
| 18 | 9 | 1057 | Octodecillion | Thousand nonillion | Nonilliard | ||
| 19 | 10 | 1060 | Novendecillion | Decillion | Decillion | ||
| 20 | 10 | 1063 | Vigintillion | Thousand decillion | Decilliard | ||
| 21 | 11 | 1066 | Unvigintillion | Undecillion | Undecillion | ||
| 22 | 11 | 1069 | Duovigintillion | Thousand undecillion | Undecilliard | ||
| 23 | 12 | 1072 | Tresvigintillion | Duodecillion | Duodecillion | ||
| 24 | 12 | 1075 | Quattuorvigintillion | Thousand duodecillion | Duodecilliard | ||
| 25 | 13 | 1078 | Quinvigintillion | Tredecillion | Tredecillion | ||
| 26 | 13 | 1081 | Sesvigintillion | Thousand tredecillion | Tredecilliard | ||
| 27 | 14 | 1084 | Septemvigintillion | Quattuordecillion | Quattuordecillion | ||
| 28 | 14 | 1087 | Octovigintillion | Thousand quattuordecillion | Quattuordecilliard | ||
| 29 | 15 | 1090 | Novemvigintillion | Quindecillion | Quindecillion | ||
| 30 | 15 | 1093 | Trigintillion | Thousand quindecillion | Quindecilliard | ||
| 31 | 16 | 1096 | Untrigintillion | Sedecillion | Sedecillion | ||
| 32 | 16 | 1099 | Duotrigintillion | Thousand sedecillion | Sedecilliard | ||
| 33 | 17 | 10102 | Trestrigintillion | Septendecillion | Septendecillion | ||
| 34 | 17 | 10105 | Quattuortrigintillion | Thousand septendecillion | Septendecilliard | ||
| 35 | 18 | 10108 | Quintrigintillion | Octodecillion | Octodecillion | ||
| 36 | 18 | 10111 | Sestrigintillion | Thousand octodecillion | Octodecilliard | ||
| 37 | 19 | 10114 | Septentrigintillion | Novendecillion | Novendecillion | ||
| 38 | 19 | 10117 | Octotrigintillion | Thousand novendecillion | Novendecilliard | ||
| 39 | 20 | 10120 | Noventrigintillion | Vigintillion | Vigintillion | ||
| 40 | 20 | 10123 | Quadragintillion | Thousand vigintillion | Vigintilliard | ||
| 50 | 25 | 10153 | Quinquagintillion | Thousand quinvigintillion | Quinvigintilliard | ||
| 60 | 30 | 10183 | Sexagintillion | Thousand trigintillion | Trigintilliard | ||
| 70 | 35 | 10213 | Septuagintillion | Thousand quintrigintillion | Quintrigintilliard | ||
| 80 | 40 | 10243 | Octogintillion | Thousand quadragintillion | Quadragintilliard | ||
| 90 | 45 | 10273 | Nonagintillion | Thousand quinquadragintillion | Quinquadragintilliard | ||
| 100 | 50 | 10303 | Centillion | Thousand quinquagintillion | Quinquagintilliard | ||
| 101 | 51 | 10306 | Uncentillion | Unquinquagintillion | Unquinquagintillion | ||
| 110 | 55 | 10333 | Decicentillion | Thousand quinquinquagintillion | Quinquinquagintilliard | ||
| 111 | 56 | 10336 | Undecicentillion | Sesquinquagintillion | Sesquinquagintillion | ||
| 120 | 60 | 10363 | Viginticentillion | Thousand sexagintillion | Sexagintilliard | ||
| 121 | 61 | 10366 | Unviginticentillion | Unsexagintillion | Unsexagintillion | ||
| 130 | 65 | 10393 | Trigintacentillion | Thousand quinsexagintillion | Quinsexagintilliard | ||
| 140 | 70 | 10423 | Quadragintacentillion | Thousand septuagintillion | Septuagintilliard | ||
| 150 | 75 | 10453 | Quinquagintacentillion | Thousand quinseptuagintillion | Quinseptuagintilliard | ||
| 160 | 80 | 10483 | Sexagintacentillion | Thousand octogintillion | Octogintilliard | ||
| 170 | 85 | 10513 | Septuagintacentillion | Thousand quinoctogintillion | Quinoctogintilliard | ||
| 180 | 90 | 10543 | Octogintacentillion | Thousand nonagintillion | Nonagintilliard | ||
| 190 | 95 | 10573 | Nonagintacentillion | Thousand quinnonagintillion | Quinnonagintilliard | ||
| 200 | 100 | 10603 | Ducentillion | Thousand centillion | Centilliard | ||
| 300 | 150 | 10903 | Trecentillion | Thousand quinquagintacentillion | Quinquagintacentilliard | ||
| 400 | 200 | 101203 | Quadringentillion | Thousand ducentillion | Ducentilliard | ||
| 500 | 250 | 101503 | Quingentillion | Thousand quinquagintaducentillion | Quinquagintaducentilliard | ||
| 600 | 300 | 101803 | Sescentillion | Thousand trecentillion | Trecentilliard | ||
| 700 | 350 | 102103 | Septingentillion | Thousand quinquagintatrecentillion | Quinquagintatrecentilliard | ||
| 800 | 400 | 102403 | Octingentillion | Thousand quadringentillion | Quadringentilliard | ||
| 900 | 450 | 102703 | Nongentillion | Thousand quinquagintaquadringentillion | Quinquagintaquadringentilliard | ||
| 1000 | 500 | 103003 | Millinillion | Thousand quingentillion | Quingentilliard |