56511030581 has 2 divisors, whose sum is σ = 56511030582. Its totient is φ = 56511030580.

The previous prime is 56511030571. The next prime is 56511030593. The reversal of 56511030581 is 18503011565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47676722500 + 8834308081 = 218350^2 + 93991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56511030581 is a prime.

It is a super-2 number, since 2×56511030581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56511030571) 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, 28255515290 + 28255515291.

It is an arithmetic number, because the mean of its divisors is an integer number (28255515291).

Almost surely, 2^56511030581 is an apocalyptic number.

It is an amenable number.

56511030581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56511030581 is an equidigital number, since it uses as much as digits as its factorization.

56511030581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 56511030581 in words is "fifty-six billion, five hundred eleven million, thirty thousand, five hundred eighty-one".