18686815264 has 48 divisors (see below), whose sum is σ = 39841139520. Its totient is φ = 8576467200.

The previous prime is 18686815237. The next prime is 18686815307. The reversal of 18686815264 is 46251868681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51012 + ... + 199939.

It is an arithmetic number, because the mean of its divisors is an integer number (830023740).

Almost surely, 2^18686815264 is an apocalyptic number.

It is an amenable number.

18686815264 is an abundant number, since it is smaller than the sum of its proper divisors (21154324256).

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

18686815264 is a wasteful number, since it uses less digits than its factorization.

18686815264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251153 (or 251145 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 55.

The spelling of 18686815264 in words is "eighteen billion, six hundred eighty-six million, eight hundred fifteen thousand, two hundred sixty-four".