18115479864 has 48 divisors (see below), whose sum is σ = 49068999720. Its totient is φ = 6037725120.

The previous prime is 18115479841. The next prime is 18115479869. The reversal of 18115479864 is 46897451181.

18115479864 is a `hidden beast` number, since 1 + 8 + 1 + 1 + 547 + 98 + 6 + 4 = 666.

It is a super-2 number, since 2×18115479864² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18115479864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18115479869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990079 + ... + 1008209.

Almost surely, 2^18115479864 is an apocalyptic number.

It is an amenable number.

18115479864 is an abundant number, since it is smaller than the sum of its proper divisors (30953519856).

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

18115479864 is a wasteful number, since it uses less digits than its factorization.

18115479864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32020 (or 32013 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 18115479864 in words is "eighteen billion, one hundred fifteen million, four hundred seventy-nine thousand, eight hundred sixty-four".