565566361 has 2 divisors, whose sum is σ = 565566362. Its totient is φ = 565566360.

The previous prime is 565566359. The next prime is 565566373. The reversal of 565566361 is 163665565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354154761 + 211411600 = 18819^2 + 14540^2 .

It is a cyclic number.

It is not a de Polignac number, because 565566361 - 2¹ = 565566359 is a prime.

Together with 565566359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (565566301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282783180 + 282783181.

It is an arithmetic number, because the mean of its divisors is an integer number (282783181).

Almost surely, 2^565566361 is an apocalyptic number.

It is an amenable number.

565566361 is a deficient number, since it is larger than the sum of its proper divisors (1).

565566361 is an equidigital number, since it uses as much as digits as its factorization.

565566361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 43.

The square root of 565566361 is about 23781.6391571313. The cubic root of 565566361 is about 826.9790801454.

The spelling of 565566361 in words is "five hundred sixty-five million, five hundred sixty-six thousand, three hundred sixty-one".