566620321 has 4 divisors (see below), whose sum is σ = 566704944. Its totient is φ = 566535700.

The previous prime is 566620291. The next prime is 566620339. The reversal of 566620321 is 123026665.

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 566620321 - 2⁵ = 566620289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566620361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31315 + ... + 45976.

It is an arithmetic number, because the mean of its divisors is an integer number (141676236).

Almost surely, 2^566620321 is an apocalyptic number.

It is an amenable number.

566620321 is a deficient number, since it is larger than the sum of its proper divisors (84623).

566620321 is an equidigital number, since it uses as much as digits as its factorization.

566620321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84622.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 566620321 is about 23803.7879548613. The cubic root of 566620321 is about 827.4924664113.

Adding to 566620321 its reverse (123026665), we get a palindrome (689646986).

The spelling of 566620321 in words is "five hundred sixty-six million, six hundred twenty thousand, three hundred twenty-one".