18378568165 has 8 divisors (see below), whose sum is σ = 23351592600. Its totient is φ = 13837980672.

The previous prime is 18378568157. The next prime is 18378568177. The reversal of 18378568165 is 56186587381.

It can be written as a sum of positive squares in 4 ways, for example, as 5941634724 + 12436933441 = 77082^2 + 111521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18378568165 - 2³ = 18378568157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108109140 + ... + 108109309.

It is an arithmetic number, because the mean of its divisors is an integer number (2918949075).

Almost surely, 2^18378568165 is an apocalyptic number.

It is an amenable number.

18378568165 is a deficient number, since it is larger than the sum of its proper divisors (4973024435).

18378568165 is a wasteful number, since it uses less digits than its factorization.

18378568165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216218471.

The product of its digits is 9676800, while the sum is 58.

The spelling of 18378568165 in words is "eighteen billion, three hundred seventy-eight million, five hundred sixty-eight thousand, one hundred sixty-five".