Web Reference: Oct 22, 2025 · Number.MAX_SAFE_INTEGER represents the largest value at which integer-level operations can be performed precisely, but you can still perform meaningful arithmetic on numbers larger than that, just without integer-level precision. Description Number.MAX_SAFE_INTEGER represents the maximum safe integer in JavaScript. Number.MAX_SAFE_INTEGER is (2 53 - 1). Nov 21, 2008 · The MAX_SAFE_INTEGER constant has a value of 9007199254740991 (9,007,199,254,740,991 or ~9 quadrillion). The reasoning behind that number is that JavaScript uses double-precision floating-point format numbers as specified in IEEE 754 and can only safely represent numbers between -(2^53 - 1) and 2^53 - 1.
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