18855555172 has 12 divisors (see below), whose sum is σ = 33194810880. Its totient is φ = 9371323496.

The previous prime is 18855555167. The next prime is 18855555203. The reversal of 18855555172 is 27155555881.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14112772 + ... + 14114107.

It is an arithmetic number, because the mean of its divisors is an integer number (2766234240).

Almost surely, 2^18855555172 is an apocalyptic number.

It is an amenable number.

18855555172 is a deficient number, since it is larger than the sum of its proper divisors (14339255708).

18855555172 is a wasteful number, since it uses less digits than its factorization.

18855555172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28227050 (or 28227048 counting only the distinct ones).

The product of its digits is 2800000, while the sum is 52.

The spelling of 18855555172 in words is "eighteen billion, eight hundred fifty-five million, five hundred fifty-five thousand, one hundred seventy-two".