643650481458084 has 48 divisors (see below), whose sum is σ = 1524280566404288. Its totient is φ = 211346012135808.

The previous prime is 643650481458079. The next prime is 643650481458319. The reversal of 643650481458084 is 480854184056346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86952954 + ... + 94064430.

Almost surely, 2^{643650481458084} is an apocalyptic number.

It is an amenable number.

643650481458084 is an abundant number, since it is smaller than the sum of its proper divisors (880630084946204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643650481458084 is a wasteful number, since it uses less digits than its factorization.

643650481458084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7224124 (or 7224122 counting only the distinct ones).

The product of its (nonzero) digits is 353894400, while the sum is 66.

The spelling of 643650481458084 in words is "six hundred forty-three trillion, six hundred fifty billion, four hundred eighty-one million, four hundred fifty-eight thousand, eighty-four".