What Is UInt64 Data Type?


Angela Bailey

The UInt64 data type is a fundamental data type in many programming languages, including C#, Java, and Python. It stands for “unsigned 64-bit integer” and is used to store non-negative whole numbers. In this article, we will explore the UInt64 data type, its characteristics, and how it can be used in programming.

Characteristics of UInt64

The UInt64 data type has the following characteristics:

  • Size: UInt64 occupies 8 bytes or 64 bits of memory.
  • Range: It can store values ranging from 0 to 18,446,744,073,709,551,615.
  • No Sign Bit: Unlike signed integer types (e.g., Int64), UInt64 does not have a sign bit. This means it can only store positive or zero values.

Usage of UInt64

The UInt64 data type is commonly used in scenarios where the range of non-negative integer values exceeds what can be stored in smaller data types like Byte, Int16, or Int32. Some common use cases include:

  • ID Generation: When generating unique identifiers or keys for entities in a database or system.
  • Data Serialization: When serializing large amounts of data that require a larger range than other integer types.
  • Cryptography: In cryptographic algorithms that involve large numbers and require precise calculations.

Examples of Using UInt64

In C#, you can declare a variable with the UInt64 data type using the ‘ulong’ keyword:

ulong myNumber = 1234567890;

You can perform arithmetic operations on UInt64 variables just like any other numeric data type:

ulong sum = myNumber + 100;
ulong product = myNumber * 2;

If you try to assign a negative value to a UInt64 variable, it will result in a compilation error. This is because UInt64 can only store non-negative values.


The UInt64 data type is used to represent non-negative 64-bit integers. It provides a larger range than smaller integer types and is commonly used in scenarios requiring the storage of large numbers.

Remember that UInt64 does not have a sign bit, so it can only store positive or zero values. Use the ulong keyword in C# to declare variables with this data type.

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