16640534625 has 64 divisors (see below), whose sum is σ = 32530837248. Its totient is φ = 7447488000.

The previous prime is 16640534597. The next prime is 16640534639. The reversal of 16640534625 is 52643504661.

It is not a de Polignac number, because 16640534625 - 2¹⁰ = 16640533601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 101532 + ... + 208781.

It is an arithmetic number, because the mean of its divisors is an integer number (508294332).

Almost surely, 2^16640534625 is an apocalyptic number.

16640534625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16640534625 is a deficient number, since it is larger than the sum of its proper divisors (15890302623).

16640534625 is a wasteful number, since it uses less digits than its factorization.

16640534625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310355 (or 310345 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 16640534625 in words is "sixteen billion, six hundred forty million, five hundred thirty-four thousand, six hundred twenty-five".