How Many Zeros in a Octodecillion?
An octodecillion has 57 zeros in the short-scale system used in the United States: 1057. The number contains 19 groups of three zeros, giving a total of 3 × 19 = 57 zeros after the leading 1. The prefix octo- means eight and dec- means ten — together indicating the 18th position in the short-scale "-illion" sequence (since octodecim is Latin for eighteen). In the British long-scale system, the same name refers to 10108, or 108 zeros. Octodecillion follows septendecillion (1054) and comes before novemdecillion (1060) on the number line. Learn more about how many zeros does a trillion have.
A octodecillion has
57
zeros
- Written Form
- 1 followed by 57 zeros
- Scientific
- 10⁵⁷
Octodecillion Written Out — What Does It Look Like?
Written out in full using standard US comma notation, one octodecillion looks like this: Learn more about how many zeros does a quindecillion have.
1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
That is the digit 1 followed by 57 zeros, for a total of 58 digits. Counting the groups: there are 19 commas separating 19 groups of three zeros, which confirms the zero count of 57.
For context, here is how octodecillion fits between its two immediate neighbors in the short-scale sequence:
| Name | Zeros | Scientific Notation |
|---|---|---|
| Septendecillion | 54 | 1054 |
| Octodecillion | 57 | 1057 |
| Novemdecillion | 60 | 1060 |
How Many Zeros in 10 Octodecillion and 100 Octodecillion?
Scaling up from one octodecillion by powers of ten simply increments the exponent:
- 1 octodecillion = 1057 — 57 zeros
- 10 octodecillion = 1058 — 58 zeros
- 100 octodecillion = 1059 — 59 zeros
- 1,000 octodecillion = 1060 — 60 zeros (= one novemdecillion)
The pattern is the same for every named number: one factor of 10 adds one zero, and one factor of 1,000 advances to the next "-illion." Scientific notation makes this explicit — the exponent always equals the zero count exactly. Related: Zeros in an octillion.