643045516 has 12 divisors (see below), whose sum is σ = 1130161032. Its totient is φ = 320142368.

The previous prime is 643045483. The next prime is 643045537. The reversal of 643045516 is 615540346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344050 + ... + 345913.

It is an arithmetic number, because the mean of its divisors is an integer number (94180086).

Almost surely, 2^643045516 is an apocalyptic number.

It is an amenable number.

643045516 is a deficient number, since it is larger than the sum of its proper divisors (487115516).

643045516 is a wasteful number, since it uses less digits than its factorization.

643045516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690200 (or 690198 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 643045516 is about 25358.3421382392. The cubic root of 643045516 is about 863.1386645687.

The spelling of 643045516 in words is "six hundred forty-three million, forty-five thousand, five hundred sixteen".