565445561 has 2 divisors, whose sum is σ = 565445562. Its totient is φ = 565445560.

The previous prime is 565445513. The next prime is 565445563. The reversal of 565445561 is 165544565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512796025 + 52649536 = 22645^2 + 7256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-565445561 is a prime.

It is a Sophie Germain prime.

Together with 565445563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (565445563) 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, 282722780 + 282722781.

It is an arithmetic number, because the mean of its divisors is an integer number (282722781).

Almost surely, 2^565445561 is an apocalyptic number.

It is an amenable number.

565445561 is a deficient number, since it is larger than the sum of its proper divisors (1).

565445561 is an equidigital number, since it uses as much as digits as its factorization.

565445561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360000, while the sum is 41.

The square root of 565445561 is about 23779.0992470278. The cubic root of 565445561 is about 826.9201974671.

It can be divided in two parts, 5654 and 45561, that added together give a palindrome (51215).

The spelling of 565445561 in words is "five hundred sixty-five million, four hundred forty-five thousand, five hundred sixty-one".