<!--
{
  "availability" : [
    "iOS: 8.0.0 -",
    "iPadOS: 8.0.0 -",
    "macCatalyst: 8.0.0 -",
    "tvOS: 10.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 2.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "HomeKit",
  "identifier" : "/documentation/HomeKit/HMCharacteristicMetadataFormatUInt64",
  "metadataVersion" : "0.1.0",
  "role" : "Global Variable",
  "symbol" : {
    "kind" : "Global Variable",
    "modules" : [
      "HomeKit"
    ],
    "preciseIdentifier" : "c:@HMCharacteristicMetadataFormatUInt64"
  },
  "title" : "HMCharacteristicMetadataFormatUInt64"
}
-->

# HMCharacteristicMetadataFormatUInt64

Indicates that the characteristic has unsigned 64-bit integer values.

```
let HMCharacteristicMetadataFormatUInt64: String
```

## Discussion

The value is an <doc://com.apple.documentation/documentation/Foundation/NSNumber> object containing an unsigned 64-bit integer with a range `[0, 18446744073709551615]`.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)