18788559956 has 24 divisors (see below), whose sum is σ = 33432667296. Its totient is φ = 9236890080.

The previous prime is 18788559941. The next prime is 18788559983. The reversal of 18788559956 is 65995588781.

It is a self number, because there is not a number n which added to its sum of digits gives 18788559956.

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, 80195 + ... + 209781.

It is an arithmetic number, because the mean of its divisors is an integer number (1393027804).

Almost surely, 2^18788559956 is an apocalyptic number.

It is an amenable number.

18788559956 is a deficient number, since it is larger than the sum of its proper divisors (14644107340).

18788559956 is a wasteful number, since it uses less digits than its factorization.

18788559956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130199 (or 130197 counting only the distinct ones).

The product of its digits is 217728000, while the sum is 71.

The spelling of 18788559956 in words is "eighteen billion, seven hundred eighty-eight million, five hundred fifty-nine thousand, nine hundred fifty-six".