What Is Data Type Int64?


Heather Bennett

What Is Data Type Int64?

The Int64 data type, also known as a signed 64-bit integer, is a fundamental data type in programming languages such as C#, Java, and Python. It is used to represent whole numbers within a specific range.

Understanding Integers

Integers are numbers without decimal points. They can be positive, negative, or zero. Common examples of integers include -10, 0, and 42.

The Need for Int64

Most programming languages provide various integer data types with different ranges. The Int64 data type is specifically designed to handle larger numbers that cannot be accommodated by smaller integer types like Int32.

The Range of Int64

An Int64 variable can hold values between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807 (inclusive). This range allows the representation of extremely large or small numbers accurately.

Usage Examples:

  • In financial applications that deal with large monetary values.
  • In scientific calculations involving astronomical figures.
  • In databases to store unique identifiers or primary keys.

Cross-Language Compatibility

The Int64 data type is widely supported across different programming languages. For example:

  • In C#, you can declare an Int64 variable using the keyword long.
  • In Java, you can use the keyword long to declare a variable of type Int64.
  • In Python, you can utilize the int data type, which has arbitrary precision and can handle very large numbers.


The Int64 data type is an essential component of programming languages and is used to handle large numerical values. Its range allows for precision and accuracy when dealing with extremely large or small numbers. Understanding this data type is crucial for developers working on projects that require handling big numerical values.

Now that you have a better understanding of the Int64 data type, you can confidently use it in your programming endeavors.

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