12556401216 has 28 divisors (see below), whose sum is σ = 33222145392. Its totient is φ = 4185467008.

The previous prime is 12556401163. The next prime is 12556401259. The reversal of 12556401216 is 61210465521.

12556401216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12556401216² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32698770 + ... + 32699153.

Almost surely, 2^12556401216 is an apocalyptic number.

12556401216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12556401216 is an abundant number, since it is smaller than the sum of its proper divisors (20665744176).

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

12556401216 is an equidigital number, since it uses as much as digits as its factorization.

12556401216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65397938 (or 65397928 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 33.

Adding to 12556401216 its reverse (61210465521), we get a palindrome (73766866737).

The spelling of 12556401216 in words is "twelve billion, five hundred fifty-six million, four hundred one thousand, two hundred sixteen".