18553720172 has 48 divisors (see below), whose sum is σ = 37012953600. Its totient is φ = 8067159360.

The previous prime is 18553720127. The next prime is 18553720177. The reversal of 18553720172 is 27102735581.

It is not an unprimeable number, because it can be changed into a prime (18553720177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124397 + ... + 229307.

It is an arithmetic number, because the mean of its divisors is an integer number (771103200).

Almost surely, 2^18553720172 is an apocalyptic number.

It is an amenable number.

18553720172 is a deficient number, since it is larger than the sum of its proper divisors (18459233428).

18553720172 is a wasteful number, since it uses less digits than its factorization.

18553720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105126 (or 105124 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 18553720172 in words is "eighteen billion, five hundred fifty-three million, seven hundred twenty thousand, one hundred seventy-two".