18637490664 has 64 divisors (see below), whose sum is σ = 55753185600. Its totient is φ = 5734611648.

The previous prime is 18637490653. The next prime is 18637490681. The reversal of 18637490664 is 46609473681.

18637490664 is a `hidden beast` number, since 186 + 374 + 90 + 6 + 6 + 4 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 18637490664.

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, 3315834 + ... + 3321449.

It is an arithmetic number, because the mean of its divisors is an integer number (871143525).

Almost surely, 2^18637490664 is an apocalyptic number.

It is an amenable number.

18637490664 is an abundant number, since it is smaller than the sum of its proper divisors (37115694936).

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

18637490664 is a wasteful number, since it uses less digits than its factorization.

18637490664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6637311 (or 6637301 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 18637490664 in words is "eighteen billion, six hundred thirty-seven million, four hundred ninety thousand, six hundred sixty-four".