56566561 has 2 divisors, whose sum is σ = 56566562. Its totient is φ = 56566560.

The previous prime is 56566507. The next prime is 56566567. The reversal of 56566561 is 16566565.

56566561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45643536 + 10923025 = 6756^2 + 3305^2 .

It is a cyclic number.

It is not a de Polignac number, because 56566561 - 2⁹ = 56566049 is a prime.

It is not a weakly prime, because it can be changed into another prime (56566567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28283280 + 28283281.

It is an arithmetic number, because the mean of its divisors is an integer number (28283281).

Almost surely, 2^56566561 is an apocalyptic number.

It is an amenable number.

56566561 is a deficient number, since it is larger than the sum of its proper divisors (1).

56566561 is an equidigital number, since it uses as much as digits as its factorization.

56566561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 40.

The square root of 56566561 is about 7521.0744578152. The cubic root of 56566561 is about 383.8721385104.

The spelling of 56566561 in words is "fifty-six million, five hundred sixty-six thousand, five hundred sixty-one".