Is this defined by the language? Is there a defined maximum? Is it different in different browsers?

# Javascript – JavaScript’s highest integer value that a number can go to without losing precision

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## Best Solution

JavaScript has two number types:

`Number`

and`BigInt`

.The most frequently-used number type,

`Number`

, is a 64-bit floating point IEEE 754 number.The largest exact integral value of this type is

`Number.MAX_SAFE_INTEGER`

, which is:^{53}-1, orTo put this in perspective: one quadrillion bytes is a petabyte (or one thousand terabytes).

"Safe" in this context refers to the ability to represent integers exactly and to correctly compare them.

From the spec:

To safely use integers larger than this, you need to use

`BigInt`

, which has no upper bound.Note that the bitwise operators and shift operators operate on 32-bit integers, so in that case, the max safe integer is 2

^{31}-1, or 2,147,483,647.Technical note on the subject of the number 9,007,199,254,740,992: There is an exact IEEE-754 representation of this value, and you can assign and read this value from a variable, so for

very carefullychosen applications in the domain of integers less than or equal to this value, you could treat this as a maximum value.In the general case, you must treat this IEEE-754 value as inexact, because it is ambiguous whether it is encoding the logical value 9,007,199,254,740,992 or 9,007,199,254,740,993.