Number.MAX_SAFE_INTEGER

The Number.MAX_SAFE_INTEGER constant represents the maximum safe integer in JavaScript (2⁵³ – 1).

For larger integers, consider using BigInt.

Value

9007199254740991 (9,007,199,254,740,991, or ~9 quadrillion).

Description

Double precision floating point format only has 52 bits to represent the mantissa, so it can only safely represent integers between -(2⁵³ – 1) and 2⁵³ – 1. "Safe" in this context refers to the ability to represent integers exactly and to compare them correctly. For example, Number.MAX_SAFE_INTEGER + 1 === Number.MAX_SAFE_INTEGER + 2 will evaluate to true, which is mathematically incorrect. See Number.isSafeInteger() for more information.

Because MAX_SAFE_INTEGER is a static property of Number, you always use it as Number.MAX_SAFE_INTEGER, rather than as a property of a number value.