[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Type](https://evolu.dev/docs/api-reference/common/Type) › UInt64

```ts
type UInt64 = bigint & Brand<"UInt64">;
```

Defined in: [packages/common/src/Type.ts:5102](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L5102)

Unsigned 64-bit [BigInt](https://evolu.dev/docs/api-reference/common/Type/variables/BigInt).