18815375864 has 16 divisors (see below), whose sum is σ = 36232312200. Its totient is φ = 9153425952.

The previous prime is 18815375861. The next prime is 18815375897. The reversal of 18815375864 is 46857351881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18815375861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31782434 + ... + 31783025.

Almost surely, 2^18815375864 is an apocalyptic number.

It is an amenable number.

18815375864 is a deficient number, since it is larger than the sum of its proper divisors (17416936336).

18815375864 is a wasteful number, since it uses less digits than its factorization.

18815375864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63565502 (or 63565498 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 56.

The spelling of 18815375864 in words is "eighteen billion, eight hundred fifteen million, three hundred seventy-five thousand, eight hundred sixty-four".