566520217 has 2 divisors, whose sum is σ = 566520218. Its totient is φ = 566520216.

The previous prime is 566520193. The next prime is 566520221. The reversal of 566520217 is 712025665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420086016 + 146434201 = 20496^2 + 12101^2 .

It is a cyclic number.

It is not a de Polignac number, because 566520217 - 2⁷ = 566520089 is a prime.

It is not a weakly prime, because it can be changed into another prime (566520277) 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 as a sum of consecutive naturals, namely, 283260108 + 283260109.

It is an arithmetic number, because the mean of its divisors is an integer number (283260109).

Almost surely, 2^566520217 is an apocalyptic number.

It is an amenable number.

566520217 is a deficient number, since it is larger than the sum of its proper divisors (1).

566520217 is an equidigital number, since it uses as much as digits as its factorization.

566520217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 566520217 is about 23801.6851714327. The cubic root of 566520217 is about 827.4437329053.

The spelling of 566520217 in words is "five hundred sixty-six million, five hundred twenty thousand, two hundred seventeen".