56561001061 has 2 divisors, whose sum is σ = 56561001062. Its totient is φ = 56561001060.

The previous prime is 56561001017. The next prime is 56561001073. The reversal of 56561001061 is 16010016565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30802356036 + 25758645025 = 175506^2 + 160495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56561001061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56561004061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28280500530 + 28280500531.

It is an arithmetic number, because the mean of its divisors is an integer number (28280500531).

Almost surely, 2^56561001061 is an apocalyptic number.

It is an amenable number.

56561001061 is a deficient number, since it is larger than the sum of its proper divisors (1).

56561001061 is an equidigital number, since it uses as much as digits as its factorization.

56561001061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 56561001061 in words is "fifty-six billion, five hundred sixty-one million, one thousand, sixty-one".