18538886872 has 64 divisors (see below), whose sum is σ = 40844707200. Its totient is φ = 7797565440.

The previous prime is 18538886831. The next prime is 18538886897. The reversal of 18538886872 is 27868883581.

It is a congruent number.

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, 57033 + ... + 200824.

It is an arithmetic number, because the mean of its divisors is an integer number (638198550).

Almost surely, 2^18538886872 is an apocalyptic number.

It is an amenable number.

18538886872 is an abundant number, since it is smaller than the sum of its proper divisors (22305820328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18538886872 is a wasteful number, since it uses less digits than its factorization.

18538886872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257936 (or 257932 counting only the distinct ones).

The product of its digits is 41287680, while the sum is 64.

The spelling of 18538886872 in words is "eighteen billion, five hundred thirty-eight million, eight hundred eighty-six thousand, eight hundred seventy-two".