18686879424 has 42 divisors (see below), whose sum is σ = 53562567500. Its totient is φ = 6228959616.

The previous prime is 18686879423. The next prime is 18686879447. The reversal of 18686879424 is 42497868681.

18686879424 is a `hidden beast` number, since 1 + 86 + 8 + 68 + 79 + 424 = 666.

It is a super-2 number, since 2×18686879424² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18686879423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16220674 + ... + 16221825.

Almost surely, 2^18686879424 is an apocalyptic number.

It is an amenable number.

18686879424 is an abundant number, since it is smaller than the sum of its proper divisors (34875688076).

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

18686879424 is a wasteful number, since it uses less digits than its factorization.

18686879424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32442517 (or 32442504 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 18686879424 in words is "eighteen billion, six hundred eighty-six million, eight hundred seventy-nine thousand, four hundred twenty-four".