18668886872 has 16 divisors (see below), whose sum is σ = 37063231560. Its totient is φ = 8785358464.

The previous prime is 18668886869. The next prime is 18668886913. The reversal of 18668886872 is 27868886681.

It is a Harshad number since it is a multiple of its sum of digits (68).

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, 68635478 + ... + 68635749.

Almost surely, 2^18668886872 is an apocalyptic number.

It is an amenable number.

18668886872 is a deficient number, since it is larger than the sum of its proper divisors (18394344688).

18668886872 is a wasteful number, since it uses less digits than its factorization.

18668886872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137271250 (or 137271246 counting only the distinct ones).

The product of its digits is 99090432, while the sum is 68.

The spelling of 18668886872 in words is "eighteen billion, six hundred sixty-eight million, eight hundred eighty-six thousand, eight hundred seventy-two".