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A Duocentillion (1 Duocentillion) is 10 to the power of 309 (10^309). This is a stupendously astronomical number!

How many zeros in a Duocentillion?

There are 309 zeros in a Duocentillion.

What's before Duocentillion?

A Uncentillion is smaller than a Duocentillion.

What's after Duocentillion?

A Trescentillion is larger than a Duocentillion.


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

Is Duocentillion the largest number?

Duocentillion 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.

Duocentillion written out

Duocentillion is written out as:


Big Numbers

This is just one of many really big numbers!

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