12519955656 has 96 divisors (see below), whose sum is σ = 36804418560. Its totient is φ = 3821924736.

The previous prime is 12519955649. The next prime is 12519955691. The reversal of 12519955656 is 65655991521.

12519955656 is a `hidden beast` number, since 1 + 25 + 19 + 9 + 556 + 56 = 666.

It is an unprimeable number.

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, 66211 + ... + 171533.

It is an arithmetic number, because the mean of its divisors is an integer number (383379360).

Almost surely, 2^12519955656 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 12519955656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18402209280).

12519955656 is an abundant number, since it is smaller than the sum of its proper divisors (24284462904).

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

12519955656 is a wasteful number, since it uses less digits than its factorization.

12519955656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105475 (or 105468 counting only the distinct ones).

The product of its digits is 3645000, while the sum is 54.

The spelling of 12519955656 in words is "twelve billion, five hundred nineteen million, nine hundred fifty-five thousand, six hundred fifty-six".