12556844378 has 16 divisors (see below), whose sum is σ = 20288433480. Its totient is φ = 5794238016.

The previous prime is 12556844309. The next prime is 12556844383. The reversal of 12556844378 is 87344865521.

It can be written as a sum of positive squares in 4 ways, for example, as 11194274809 + 1362569569 = 105803^2 + 36913^2 .

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 7 ways as a sum of consecutive naturals, for example, 80168 + ... + 177596.

Almost surely, 2^12556844378 is an apocalyptic number.

12556844378 is a deficient number, since it is larger than the sum of its proper divisors (7731589102).

12556844378 is a wasteful number, since it uses less digits than its factorization.

12556844378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102401.

The product of its digits is 6451200, while the sum is 53.

The spelling of 12556844378 in words is "twelve billion, five hundred fifty-six million, eight hundred forty-four thousand, three hundred seventy-eight".