12556055161 has 4 divisors (see below), whose sum is σ = 13521905572. Its totient is φ = 11590204752.

The previous prime is 12556055131. The next prime is 12556055167. The reversal of 12556055161 is 16155065521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2347983936 + 10208071225 = 48456^2 + 101035^2 .

It is a cyclic number.

It is not a de Polignac number, because 12556055161 - 2⁵ = 12556055129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12556055161.

It is not an unprimeable number, because it can be changed into a prime (12556055167) 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, 482925186 + ... + 482925211.

It is an arithmetic number, because the mean of its divisors is an integer number (3380476393).

Almost surely, 2^12556055161 is an apocalyptic number.

It is an amenable number.

12556055161 is a deficient number, since it is larger than the sum of its proper divisors (965850411).

12556055161 is an equidigital number, since it uses as much as digits as its factorization.

12556055161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965850410.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 12556055161 in words is "twelve billion, five hundred fifty-six million, fifty-five thousand, one hundred sixty-one".