12556411265 has 4 divisors (see below), whose sum is σ = 15067693524. Its totient is φ = 10045129008.

The previous prime is 12556411247. The next prime is 12556411267. The reversal of 12556411265 is 56211465521.

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 5578147969 + 6978263296 = 74687^2 + 83536^2 .

It is a cyclic number.

It is not a de Polignac number, because 12556411265 - 2¹² = 12556407169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12556411267) 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, 1255641122 + ... + 1255641131.

It is an arithmetic number, because the mean of its divisors is an integer number (3766923381).

Almost surely, 2^12556411265 is an apocalyptic number.

It is an amenable number.

12556411265 is a deficient number, since it is larger than the sum of its proper divisors (2511282259).

12556411265 is an equidigital number, since it uses as much as digits as its factorization.

12556411265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511282258.

The product of its digits is 72000, while the sum is 38.

Adding to 12556411265 its reverse (56211465521), we get a palindrome (68767876786).

The spelling of 12556411265 in words is "twelve billion, five hundred fifty-six million, four hundred eleven thousand, two hundred sixty-five".