18503953272 has 48 divisors (see below), whose sum is σ = 57274142640. Its totient is φ = 5286843648.

The previous prime is 18503953241. The next prime is 18503953277. The reversal of 18503953272 is 27235930581.

18503953272 is a `hidden beast` number, since 1 + 85 + 0 + 39 + 532 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18503953277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18356593 + ... + 18357600.

It is an arithmetic number, because the mean of its divisors is an integer number (1193211305).

Almost surely, 2^18503953272 is an apocalyptic number.

18503953272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18503953272 is an abundant number, since it is smaller than the sum of its proper divisors (38770189368).

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

18503953272 is a wasteful number, since it uses less digits than its factorization.

18503953272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36714212 (or 36714205 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 18503953272 in words is "eighteen billion, five hundred three million, nine hundred fifty-three thousand, two hundred seventy-two".