18761213188172 has 36 divisors (see below), whose sum is σ = 40630793068656. Its totient is φ = 7422018402240.

The previous prime is 18761213188163. The next prime is 18761213188183. The reversal of 18761213188172 is 27188131216781.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1982371979 + ... + 1982381442.

It is an arithmetic number, because the mean of its divisors is an integer number (1128633140796).

Almost surely, 2^{18761213188172} is an apocalyptic number.

It is an amenable number.

18761213188172 is an abundant number, since it is smaller than the sum of its proper divisors (21869579880484).

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

18761213188172 is a wasteful number, since it uses less digits than its factorization.

18761213188172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964753458 (or 3964753443 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 56.

The spelling of 18761213188172 in words is "eighteen trillion, seven hundred sixty-one billion, two hundred thirteen million, one hundred eighty-eight thousand, one hundred seventy-two".