565665 has 16 divisors (see below), whose sum is σ = 927168. Its totient is φ = 294336.

The previous prime is 565661. The next prime is 565667. The reversal of 565665 is 566565.

It is not a de Polignac number, because 565665 - 2² = 565661 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 565665.

It is not an unprimeable number, because it can be changed into a prime (565661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207 + ... + 1083.

It is an arithmetic number, because the mean of its divisors is an integer number (57948).

2⁵⁶⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

565665 is a deficient number, since it is larger than the sum of its proper divisors (361503).

565665 is a wasteful number, since it uses less digits than its factorization.

565665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

The product of its digits is 27000, while the sum is 33.

The square root of 565665 is about 752.1070402542. The cubic root of 565665 is about 82.7027154461.

Subtracting 565665 from its reverse (566565), we obtain a square (900 = 30²).

The spelling of 565665 in words is "five hundred sixty-five thousand, six hundred sixty-five".