A Duoseptuagintaducentillion (1 Duoseptuagintaducentillion) is 10 to the power of 819 (10^819). This is a stupendously astronomical number!

## How many zeros in a Duoseptuagintaducentillion?

There are 819 zeros in a Duoseptuagintaducentillion.

## What's before Duoseptuagintaducentillion?

A Unseptuagintaducentillion is smaller than a Duoseptuagintaducentillion.

## What's after Duoseptuagintaducentillion?

A Treseptuagintaducentillion is larger than a Duoseptuagintaducentillion.

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

## Is Duoseptuagintaducentillion the largest number?

Duoseptuagintaducentillion 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.

## Duoseptuagintaducentillion written out

Duoseptuagintaducentillion is written out as:

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

## Big Numbers

This is just one of many really big numbers!