56512004581 has 2 divisors, whose sum is σ = 56512004582. Its totient is φ = 56512004580.

The previous prime is 56512004567. The next prime is 56512004599. The reversal of 56512004581 is 18540021565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30908804481 + 25603200100 = 175809^2 + 160010^2 .

It is a cyclic number.

It is not a de Polignac number, because 56512004581 - 2⁷ = 56512004453 is a prime.

It is a super-2 number, since 2×56512004581² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56512004581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56512004881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28256002290 + 28256002291.

It is an arithmetic number, because the mean of its divisors is an integer number (28256002291).

Almost surely, 2^56512004581 is an apocalyptic number.

It is an amenable number.

56512004581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56512004581 is an equidigital number, since it uses as much as digits as its factorization.

56512004581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 56512004581 in words is "fifty-six billion, five hundred twelve million, four thousand, five hundred eighty-one".