8566 has 4 divisors (see below), whose sum is σ = 12852. Its totient is φ = 4282.

The previous prime is 8563. The next prime is 8573. The reversal of 8566 is 6658.

8566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6658 = 2 ⋅3329.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 8566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8563) 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 as a sum of consecutive naturals, namely, 2140 + ... + 2143.

It is an arithmetic number, because the mean of its divisors is an integer number (3213).

2⁸⁵⁶⁶ is an apocalyptic number.

8566 is a deficient number, since it is larger than the sum of its proper divisors (4286).

8566 is a wasteful number, since it uses less digits than its factorization.

8566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285.

The product of its digits is 1440, while the sum is 25.

The square root of 8566 is about 92.5526876973. The cubic root of 8566 is about 20.4609608010.

It can be divided in two parts, 85 and 66, that added together give a palindrome (151).

The spelling of 8566 in words is "eight thousand, five hundred sixty-six".