javascript/jQuery VAR maxium length -

i tried google it, key words references funtions or solutions working content of variable.

my question simple. if variable represents number,

var = 1; 

what max bit length? mean, highest number can contain before buffer overflow happens? int32? int64? different length?

thanks in advance

as the spec says, numbers in javascript ieee-754 double-precision floating point:

• they're 64 bits in size.
• their range -1.7976931348623157e+308 through 1.7976931348623157e+308 (that latter available via number.max_value), positive , negative versions of (2 - 2^-52) × 2^1023, can't represent of values. famously, 0.1 + 0.2 comes out 0.30000000000000004; see is floating-point math broken?
• the max "safe" integer value (whole number value won't imprecise) 9,007,199,254,740,991, available number.max_safe_integer on es2015-compliant javascript engines.
• similarly, min_safe_integer -9,007,199,254,740,991