18538663164 has 48 divisors (see below), whose sum is σ = 49501568256. Its totient is φ = 5289782400.

The previous prime is 18538663151. The next prime is 18538663207. The reversal of 18538663164 is 46136683581.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81082 + ... + 208929.

It is an arithmetic number, because the mean of its divisors is an integer number (1031282672).

Almost surely, 2^18538663164 is an apocalyptic number.

18538663164 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18538663164 is an abundant number, since it is smaller than the sum of its proper divisors (30962905092).

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

18538663164 is a wasteful number, since it uses less digits than its factorization.

18538663164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290786 (or 290784 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The spelling of 18538663164 in words is "eighteen billion, five hundred thirty-eight million, six hundred sixty-three thousand, one hundred sixty-four".