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A Septillion (1 Septillion) is 10 to the power of 24 (10^24). This is an extremely large number!

How many zeros in a Septillion?

There are 24 zeros in a Septillion.

What's before Septillion?

A Sextillion is smaller than a Septillion.

What's after Septillion?

A Octillion is larger than a Septillion.


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

Is Septillion the largest number?

Septillion 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.

Septillion written out

Septillion is written out as:


Big Numbers

This is just one of many really big numbers!

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