566561 has 4 divisors (see below), whose sum is σ = 596400. Its totient is φ = 536724.

The previous prime is 566557. The next prime is 566563. The reversal of 566561 is 165665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 566561 - 2² = 566557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566563) 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 3 ways as a sum of consecutive naturals, for example, 14891 + ... + 14928.

It is an arithmetic number, because the mean of its divisors is an integer number (149100).

2⁵⁶⁶⁵⁶¹ is an apocalyptic number.

It is an amenable number.

566561 is a deficient number, since it is larger than the sum of its proper divisors (29839).

566561 is a wasteful number, since it uses less digits than its factorization.

566561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29838.

The product of its digits is 5400, while the sum is 29.

The square root of 566561 is about 752.7024644572. The cubic root of 566561 is about 82.7463587935.

It can be divided in two parts, 5 and 66561, that added together give a palindrome (66566).

The spelling of 566561 in words is "five hundred sixty-six thousand, five hundred sixty-one".