# PRUint64

Guaranteed to be an unsigned 64-bit integer on all platforms.

## Syntax

```{code}
#include <prtypes.h>

typedef definition PRUint64;
```

## Description

May be defined in several different ways, depending on the platform. For
syntax details for each platform, see
{searchfox}`prtypes.h <nsprpub/pr/include/prtypes.h>`.