56611265209 has 2 divisors, whose sum is σ = 56611265210. Its totient is φ = 56611265208.

The previous prime is 56611265203. The next prime is 56611265273. The reversal of 56611265209 is 90256211665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56584515625 + 26749584 = 237875^2 + 5172^2 .

It is a cyclic number.

It is not a de Polignac number, because 56611265209 - 2²⁷ = 56477047481 is a prime.

It is not a weakly prime, because it can be changed into another prime (56611265203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28305632604 + 28305632605.

It is an arithmetic number, because the mean of its divisors is an integer number (28305632605).

Almost surely, 2^56611265209 is an apocalyptic number.

It is an amenable number.

56611265209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56611265209 is an equidigital number, since it uses as much as digits as its factorization.

56611265209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 56611265209 in words is "fifty-six billion, six hundred eleven million, two hundred sixty-five thousand, two hundred nine".