566249681 has 2 divisors, whose sum is σ = 566249682. Its totient is φ = 566249680.

The previous prime is 566249657. The next prime is 566249699. The reversal of 566249681 is 186942665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288694081 + 277555600 = 16991^2 + 16660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-566249681 is a prime.

It is a super-2 number, since 2×566249681² = 641277402465203522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (566249611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283124840 + 283124841.

It is an arithmetic number, because the mean of its divisors is an integer number (283124841).

Almost surely, 2^566249681 is an apocalyptic number.

It is an amenable number.

566249681 is a deficient number, since it is larger than the sum of its proper divisors (1).

566249681 is an equidigital number, since it uses as much as digits as its factorization.

566249681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 566249681 is about 23796.0013657757. The cubic root of 566249681 is about 827.3119994717.

The spelling of 566249681 in words is "five hundred sixty-six million, two hundred forty-nine thousand, six hundred eighty-one".