18571774956 has 48 divisors (see below), whose sum is σ = 50578461696. Its totient is φ = 5193321984.

The previous prime is 18571774943. The next prime is 18571775011. The reversal of 18571774956 is 65947717581.

It is a self number, because there is not a number n which added to its sum of digits gives 18571774956.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2348101 + ... + 2355996.

It is an arithmetic number, because the mean of its divisors is an integer number (1053717952).

Almost surely, 2^18571774956 is an apocalyptic number.

It is an amenable number.

18571774956 is an abundant number, since it is smaller than the sum of its proper divisors (32006686740).

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

18571774956 is a wasteful number, since it uses less digits than its factorization.

18571774956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704158 (or 4704156 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 60.

The spelling of 18571774956 in words is "eighteen billion, five hundred seventy-one million, seven hundred seventy-four thousand, nine hundred fifty-six".