18517775952 has 80 divisors (see below), whose sum is σ = 52773997248. Its totient is φ = 5558799360.

The previous prime is 18517775909. The next prime is 18517775987. The reversal of 18517775952 is 25957771581.

It is a junction number, because it is equal to n+sod(n) for n = 18517775892 and 18517775901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336318 + ... + 387485.

Almost surely, 2^18517775952 is an apocalyptic number.

18517775952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18517775952 is an abundant number, since it is smaller than the sum of its proper divisors (34256221296).

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

18517775952 is a wasteful number, since it uses less digits than its factorization.

18517775952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723868 (or 723862 counting only the distinct ones).

The product of its digits is 6174000, while the sum is 57.

The spelling of 18517775952 in words is "eighteen billion, five hundred seventeen million, seven hundred seventy-five thousand, nine hundred fifty-two".