566861 has 4 divisors (see below), whose sum is σ = 568800. Its totient is φ = 564924.

The previous prime is 566857. The next prime is 566879. The reversal of 566861 is 168665.

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 566861 - 2² = 566857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431 + ... + 1148.

It is an arithmetic number, because the mean of its divisors is an integer number (142200).

2⁵⁶⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

566861 is a deficient number, since it is larger than the sum of its proper divisors (1939).

566861 is a wasteful number, since it uses less digits than its factorization.

566861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938.

The product of its digits is 8640, while the sum is 32.

The square root of 566861 is about 752.9017200140. The cubic root of 566861 is about 82.7609612385.

It can be divided in two parts, 5 and 66861, that added together give a palindrome (66866).

The spelling of 566861 in words is "five hundred sixty-six thousand, eight hundred sixty-one".