18
18 zero's are in a quintillion.
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Quintillion has eighteen zeros. 1,000,000,000,000,000,000
15 zeros
There are eighteen zero's, just like 1 quintillion.1 quintillion: 1,000,000,000,000,000,00013 quintillion: 13,000,000,000,000,000,000
If you allow for zeros, that's 10^16, which is ten quintillion, or 10,000,000,000,000,000. If not, it's 9^16, which is 1,853,020,188,851,841, or 1.85 quintillion. (1.85x10^15)
Written out it would be 1 followed by 19 zeros. In the short scale, it is 10 quintillion.