The Number.MAX_SAFE_INTEGER
static data property represents the maximum safe integer in JavaScript (253 – 1).
For larger integers, consider using BigInt
.
The Number.MAX_SAFE_INTEGER
static data property represents the maximum safe integer in JavaScript (253 – 1).
For larger integers, consider using BigInt
.
9007199254740991
(9,007,199,254,740,991, or ~9 quadrillion).
Property attributes of Number.MAX_SAFE_INTEGER
| |
---|---|
Writable | no |
Enumerable | no |
Configurable | no |
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.
Number.MAX_SAFE_INTEGER; // 9007199254740991
Number.EPSILON
is 2-52, while MAX_SAFE_INTEGER
is 253 – 1 — both of them are derived from the width of the mantissa, which is 53 bits (with the highest bit always being 1). Multiplying them will give a value very close — but not equal — to 2.
Number.MAX_SAFE_INTEGER * Number.EPSILON; // 1.9999999999999998
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
MAX_SAFE_INTEGER |
34 | 12 | 31 | 21 | 9 | 34 | 31 | 21 | 9 | 2.0 | 37 | 1.0 | 0.12.0 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER