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A Septencentillion (1 Septencentillion) is 10 to the power of 324 (10^324). This is an excessively astronomical number!

How many zeros in a Septencentillion?

There are 324 zeros in a Septencentillion.

What's before Septencentillion?

A Sexcentillion is smaller than a Septencentillion.

What's after Septencentillion?

A Octocentillion is larger than a Septencentillion.


A Septencentillionaire is someone whos assets, net worth or wealth is 1 or more Septencentillion. It is unlikely anyone will ever be a true Septencentillionaire. If you want to be a Septencentillionaire, play Tap Tales!

Is Septencentillion the largest number?

Septencentillion is not the largest number. Infinity best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.

Septencentillion written out

Septencentillion is written out as:


Big Numbers

This is just one of many really big numbers!

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