56505569 has 12 divisors (see below), whose sum is σ = 61434384. Its totient is φ = 51933504.

The previous prime is 56505557. The next prime is 56505607. The reversal of 56505569 is 96550565.

It is a de Polignac number, because none of the positive numbers 2^k-56505569 is a prime.

It is a super-2 number, since 2×56505569² = 6385758656027522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56505269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10154 + ... + 14700.

It is an arithmetic number, because the mean of its divisors is an integer number (5119532).

Almost surely, 2^56505569 is an apocalyptic number.

It is an amenable number.

56505569 is a deficient number, since it is larger than the sum of its proper divisors (4928815).

56505569 is a wasteful number, since it uses less digits than its factorization.

56505569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624 (or 4607 counting only the distinct ones).

The product of its (nonzero) digits is 202500, while the sum is 41.

The square root of 56505569 is about 7517.0186244282. The cubic root of 56505569 is about 383.7341208721.

It can be divided in two parts, 5650556 and 9, that added together give a palindrome (5650565).

The spelling of 56505569 in words is "fifty-six million, five hundred five thousand, five hundred sixty-nine".