12515408856 has 96 divisors (see below), whose sum is σ = 34190956800. Its totient is φ = 4135631040.

The previous prime is 12515408827. The next prime is 12515408887. The reversal of 12515408856 is 65880451521.

12515408856 is a `hidden beast` number, since 1 + 2 + 51 + 540 + 8 + 8 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5277351 + ... + 5279721.

It is an arithmetic number, because the mean of its divisors is an integer number (356155800).

Almost surely, 2^12515408856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12515408856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17095478400).

12515408856 is an abundant number, since it is smaller than the sum of its proper divisors (21675547944).

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

12515408856 is a wasteful number, since it uses less digits than its factorization.

12515408856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989 (or 2982 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 12515408856 in words is "twelve billion, five hundred fifteen million, four hundred eight thousand, eight hundred fifty-six".