18957564688 has 20 divisors (see below), whose sum is σ = 38890886940. Its totient is φ = 8921206784.

The previous prime is 18957564679. The next prime is 18957564713. The reversal of 18957564688 is 88646575981.

It can be written as a sum of positive squares in 2 ways, for example, as 16355340544 + 2602224144 = 127888^2 + 51012^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34848193 + ... + 34848736.

It is an arithmetic number, because the mean of its divisors is an integer number (1944544347).

Almost surely, 2^18957564688 is an apocalyptic number.

It is an amenable number.

18957564688 is an abundant number, since it is smaller than the sum of its proper divisors (19933322252).

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

18957564688 is a wasteful number, since it uses less digits than its factorization.

18957564688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69696954 (or 69696948 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 67.

The spelling of 18957564688 in words is "eighteen billion, nine hundred fifty-seven million, five hundred sixty-four thousand, six hundred eighty-eight".