56660581 has 2 divisors, whose sum is σ = 56660582. Its totient is φ = 56660580.

The previous prime is 56660567. The next prime is 56660599. The reversal of 56660581 is 18506665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53787556 + 2873025 = 7334^2 + 1695^2 .

It is a cyclic number.

It is not a de Polignac number, because 56660581 - 2⁷ = 56660453 is a prime.

It is a super-2 number, since 2×56660581² = 6420842878515122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56660581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56660561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28330290 + 28330291.

It is an arithmetic number, because the mean of its divisors is an integer number (28330291).

Almost surely, 2^56660581 is an apocalyptic number.

It is an amenable number.

56660581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56660581 is an equidigital number, since it uses as much as digits as its factorization.

56660581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 56660581 is about 7527.3222994635. The cubic root of 56660581 is about 384.0847003734.

The spelling of 56660581 in words is "fifty-six million, six hundred sixty thousand, five hundred eighty-one".