javascript bigint

const theBiggestInt = 9007199254740991n
const alsoHuge = BigInt(9007199254740991) // 9007199254740991n
const hugeString = BigInt("9007199254740991") // 9007199254740991n
const hugeHex = BigInt("0x1fffffffffffff") // 9007199254740991n
const hugeBin = BigInt("0b11111111111111111111111111111111111111111111111111111") // 9007199254740991n

BigInt( number ) 
or
Appending n to end of an integer literal