12556907680 has 24 divisors (see below), whose sum is σ = 29665694772. Its totient is φ = 5022763008.

The previous prime is 12556907677. The next prime is 12556907689. The reversal of 12556907680 is 8670965521.

It can be written as a sum of positive squares in 2 ways, for example, as 12514449424 + 42458256 = 111868^2 + 6516^2 .

It is not an unprimeable number, because it can be changed into a prime (12556907689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39240177 + ... + 39240496.

Almost surely, 2^12556907680 is an apocalyptic number.

12556907680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12556907680 is an abundant number, since it is smaller than the sum of its proper divisors (17108787092).

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

12556907680 is an equidigital number, since it uses as much as digits as its factorization.

12556907680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78480688 (or 78480680 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 12556907680 in words is "twelve billion, five hundred fifty-six million, nine hundred seven thousand, six hundred eighty".