56561565 has 16 divisors (see below), whose sum is σ = 90637056. Its totient is φ = 30120000.

The previous prime is 56561563. The next prime is 56561621. The reversal of 56561565 is 56516565.

It is not a de Polignac number, because 56561565 - 2¹ = 56561563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561563) 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 in 15 ways as a sum of consecutive naturals, for example, 8755 + ... + 13775.

It is an arithmetic number, because the mean of its divisors is an integer number (5664816).

Almost surely, 2^56561565 is an apocalyptic number.

It is an amenable number.

56561565 is a deficient number, since it is larger than the sum of its proper divisors (34075491).

56561565 is a wasteful number, since it uses less digits than its factorization.

56561565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780.

The product of its digits is 135000, while the sum is 39.

The square root of 56561565 is about 7520.7423170855. The cubic root of 56561565 is about 383.8608368884.

The spelling of 56561565 in words is "fifty-six million, five hundred sixty-one thousand, five hundred sixty-five".