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.