566621 has 4 divisors (see below), whose sum is σ = 618144. Its totient is φ = 515100.

The previous prime is 566617. The next prime is 566633. The reversal of 566621 is 126665.

566621 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 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 566621 - 2² = 566617 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 (566681) 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, 25745 + ... + 25766.

It is an arithmetic number, because the mean of its divisors is an integer number (154536).

2⁵⁶⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

566621 is a deficient number, since it is larger than the sum of its proper divisors (51523).

566621 is a wasteful number, since it uses less digits than its factorization.

566621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51522.

The product of its digits is 2160, while the sum is 26.

The square root of 566621 is about 752.7423197881. The cubic root of 566621 is about 82.7492796948.

The spelling of 566621 in words is "five hundred sixty-six thousand, six hundred twenty-one".