15624921875 has 16 divisors (see below), whose sum is σ = 19531200000. Its totient is φ = 12499875000.

The previous prime is 15624921853. The next prime is 15624921899. The reversal of 15624921875 is 57812942651.

It is not a de Polignac number, because 15624921875 - 2¹⁰ = 15624920851 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21875 + ... + 178124.

It is an arithmetic number, because the mean of its divisors is an integer number (1220700000).

Almost surely, 2^15624921875 is an apocalyptic number.

15624921875 is a deficient number, since it is larger than the sum of its proper divisors (3906278125).

15624921875 is an frugal number, since it uses more digits than its factorization.

15624921875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200034 (or 200004 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The spelling of 15624921875 in words is "fifteen billion, six hundred twenty-four million, nine hundred twenty-one thousand, eight hundred seventy-five".