18378975165618 has 32 divisors (see below), whose sum is σ = 38366955107712. Its totient is φ = 5858308051200.

The previous prime is 18378975165533. The next prime is 18378975165701. The reversal of 18378975165618 is 81656157987381.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18378975165618.

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, 18316903 + ... + 19294218.

It is an arithmetic number, because the mean of its divisors is an integer number (1198967347116).

Almost surely, 2^{18378975165618} is an apocalyptic number.

18378975165618 is an abundant number, since it is smaller than the sum of its proper divisors (19987979942094).

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

18378975165618 is a wasteful number, since it uses less digits than its factorization.

18378975165618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37614690.

The product of its digits is 609638400, while the sum is 75.

The spelling of 18378975165618 in words is "eighteen trillion, three hundred seventy-eight billion, nine hundred seventy-five million, one hundred sixty-five thousand, six hundred eighteen".