565651561 has 2 divisors, whose sum is σ = 565651562. Its totient is φ = 565651560.

The previous prime is 565651519. The next prime is 565651573. The reversal of 565651561 is 165156565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565535961 + 115600 = 23781^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 565651561 - 2⁹ = 565651049 is a prime.

It is not a weakly prime, because it can be changed into another prime (565651501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282825780 + 282825781.

It is an arithmetic number, because the mean of its divisors is an integer number (282825781).

Almost surely, 2^565651561 is an apocalyptic number.

It is an amenable number.

565651561 is a deficient number, since it is larger than the sum of its proper divisors (1).

565651561 is an equidigital number, since it uses as much as digits as its factorization.

565651561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135000, while the sum is 40.

The square root of 565651561 is about 23783.4303875618. The cubic root of 565651561 is about 827.0206049393.

The spelling of 565651561 in words is "five hundred sixty-five million, six hundred fifty-one thousand, five hundred sixty-one".