16640452564 has 12 divisors (see below), whose sum is σ = 29228250688. Its totient is φ = 8289523800.

The previous prime is 16640452547. The next prime is 16640452573. The reversal of 16640452564 is 46525404661.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16640452564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7674402 + ... + 7676569.

Almost surely, 2^16640452564 is an apocalyptic number.

It is an amenable number.

16640452564 is a deficient number, since it is larger than the sum of its proper divisors (12587798124).

16640452564 is a wasteful number, since it uses less digits than its factorization.

16640452564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15351246 (or 15351244 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 16640452564 in words is "sixteen billion, six hundred forty million, four hundred fifty-two thousand, five hundred sixty-four".