18551116272 has 40 divisors (see below), whose sum is σ = 51610158544. Its totient is φ = 5708035584.

The previous prime is 18551116267. The next prime is 18551116273. The reversal of 18551116272 is 27261115581.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 18551116272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18551116273) 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 7 ways as a sum of consecutive naturals, for example, 14864053 + ... + 14865300.

Almost surely, 2^18551116272 is an apocalyptic number.

18551116272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18551116272 is an abundant number, since it is smaller than the sum of its proper divisors (33059042272).

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

18551116272 is a wasteful number, since it uses less digits than its factorization.

18551116272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29729377 (or 29729371 counting only the distinct ones).

The product of its digits is 33600, while the sum is 39.

The spelling of 18551116272 in words is "eighteen billion, five hundred fifty-one million, one hundred sixteen thousand, two hundred seventy-two".