566628221 has 2 divisors, whose sum is σ = 566628222. Its totient is φ = 566628220.

The previous prime is 566628169. The next prime is 566628269. The reversal of 566628221 is 122826665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359671225 + 206956996 = 18965^2 + 14386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566628221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (566628521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283314110 + 283314111.

It is an arithmetic number, because the mean of its divisors is an integer number (283314111).

Almost surely, 2^566628221 is an apocalyptic number.

It is an amenable number.

566628221 is a deficient number, since it is larger than the sum of its proper divisors (1).

566628221 is an equidigital number, since it uses as much as digits as its factorization.

566628221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 566628221 is about 23803.9538942588. The cubic root of 566628221 is about 827.4963121141.

The spelling of 566628221 in words is "five hundred sixty-six million, six hundred twenty-eight thousand, two hundred twenty-one".