15115986864 has 120 divisors (see below), whose sum is σ = 48578587200. Its totient is φ = 4339509120.

The previous prime is 15115986863. The next prime is 15115986871. The reversal of 15115986864 is 46868951151.

15115986864 is a `hidden beast` number, since 1 + 511 + 5 + 9 + 8 + 68 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 15115986864.

It is not an unprimeable number, because it can be changed into a prime (15115986863) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 221034 + ... + 281225.

It is an arithmetic number, because the mean of its divisors is an integer number (404821560).

Almost surely, 2^15115986864 is an apocalyptic number.

It is an amenable number.

15115986864 is an abundant number, since it is smaller than the sum of its proper divisors (33462600336).

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

15115986864 is a wasteful number, since it uses less digits than its factorization.

15115986864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502303 (or 502294 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The spelling of 15115986864 in words is "fifteen billion, one hundred fifteen million, nine hundred eighty-six thousand, eight hundred sixty-four".