56491706561 has 2 divisors, whose sum is σ = 56491706562. Its totient is φ = 56491706560.

The previous prime is 56491706521. The next prime is 56491706641. The reversal of 56491706561 is 16560719465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56484652225 + 7054336 = 237665^2 + 2656^2 .

It is a cyclic number.

It is not a de Polignac number, because 56491706561 - 2³⁴ = 39311837377 is a prime.

It is not a weakly prime, because it can be changed into another prime (56491706501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28245853280 + 28245853281.

It is an arithmetic number, because the mean of its divisors is an integer number (28245853281).

Almost surely, 2^56491706561 is an apocalyptic number.

It is an amenable number.

56491706561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56491706561 is an equidigital number, since it uses as much as digits as its factorization.

56491706561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 56491706561 in words is "fifty-six billion, four hundred ninety-one million, seven hundred six thousand, five hundred sixty-one".