1 followed by 18 zeros is a quintillion.
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That depends how many zeros follow the 1.
1 decillion
The number with 18 zeros is called a quintillion in the short scale, which is written as 1 followed by 18 zeros: 1,000,000,000,000,000,000. In scientific notation, it can be expressed as (10^{18}).
That's a tredecillion!
If you meant a number followed by 100 zeros, that would be Google if the number was a 1. If you meant 100 zeros followed by a number, that would be just that number.