Regular numbers in JavaScript are stored in 64-bit format IEEE-754, also known as “double precision floating point numbers”.
BigInt numbers represent integers of arbitrary length.
The base can vary from 2 to 36. By default, it’s 10.
We can convert it to a number using the unary plus or a Number() call, e.g. write +num.toFixed(5).
Internally, a number is represented in 64-bit format IEEE-754, so there are exactly 64 bits to store a number: 52 of them are used to store the digits, 11 of them store the position of the decimal point, and 1 bit is for the sign.
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