18936289632178 has 16 divisors (see below), whose sum is σ = 28940645462976. Its totient is φ = 9289411246960.

The previous prime is 18936289632151. The next prime is 18936289632233. The reversal of 18936289632178 is 87123698263981.

It is a self number, because there is not a number n which added to its sum of digits gives 18936289632178.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10982925 + ... + 12589567.

It is an arithmetic number, because the mean of its divisors is an integer number (1808790341436).

Almost surely, 2^{18936289632178} is an apocalyptic number.

18936289632178 is a deficient number, since it is larger than the sum of its proper divisors (10004355830798).

18936289632178 is a wasteful number, since it uses less digits than its factorization.

18936289632178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717889.

The product of its digits is 376233984, while the sum is 73.

The spelling of 18936289632178 in words is "eighteen trillion, nine hundred thirty-six billion, two hundred eighty-nine million, six hundred thirty-two thousand, one hundred seventy-eight".