18574561872 has 40 divisors (see below), whose sum is σ = 53315873280. Its totient is φ = 6191520480.

The previous prime is 18574561849. The next prime is 18574561883. The reversal of 18574561872 is 27816547581.

18574561872 is a `hidden beast` number, since 1 + 8 + 5 + 7 + 4 + 561 + 8 + 72 = 666.

It is a super-3 number, since 3×18574561872³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21497904 + ... + 21498767.

It is an arithmetic number, because the mean of its divisors is an integer number (1332896832).

Almost surely, 2^18574561872 is an apocalyptic number.

18574561872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18574561872 is an abundant number, since it is smaller than the sum of its proper divisors (34741311408).

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

18574561872 is a wasteful number, since it uses less digits than its factorization.

18574561872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42996688 (or 42996676 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The spelling of 18574561872 in words is "eighteen billion, five hundred seventy-four million, five hundred sixty-one thousand, eight hundred seventy-two".