566252221 has 4 divisors (see below), whose sum is σ = 567234172. Its totient is φ = 565270272.

The previous prime is 566252177. The next prime is 566252227. The reversal of 566252221 is 122252665.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 344659225 + 221592996 = 18565^2 + 14886^2 .

It is a cyclic number.

It is not a de Polignac number, because 566252221 - 2²³ = 557863613 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 (566252227) 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, 490110 + ... + 491263.

It is an arithmetic number, because the mean of its divisors is an integer number (141808543).

Almost surely, 2^566252221 is an apocalyptic number.

It is an amenable number.

566252221 is a deficient number, since it is larger than the sum of its proper divisors (981951).

566252221 is an equidigital number, since it uses as much as digits as its factorization.

566252221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981950.

The product of its digits is 14400, while the sum is 31.

The square root of 566252221 is about 23796.0547360271. The cubic root of 566252221 is about 827.3132364815.

The spelling of 566252221 in words is "five hundred sixty-six million, two hundred fifty-two thousand, two hundred twenty-one".