565565 has 32 divisors (see below), whose sum is σ = 919296. Its totient is φ = 322560.

The previous prime is 565559. The next prime is 565567.

565565 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 565565 - 2⁴ = 565549 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4949 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2⁵⁶⁵⁵⁶⁵ is an apocalyptic number.

565565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

565565 is a deficient number, since it is larger than the sum of its proper divisors (353731).

565565 is a wasteful number, since it uses less digits than its factorization.

565565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149.

The product of its digits is 22500, while the sum is 32.

The square root of 565565 is about 752.0405574170. The cubic root of 565565 is about 82.6978416787.

The spelling of 565565 in words is "five hundred sixty-five thousand, five hundred sixty-five".