565161561 has 6 divisors (see below), whose sum is σ = 816344490. Its totient is φ = 376774368.

The previous prime is 565161539. The next prime is 565161563. The reversal of 565161561 is 165161565.

It can be written as a sum of positive squares in only one way, i.e., 395015625 + 170145936 = 19875^2 + 13044^2 .

It is not a de Polignac number, because 565161561 - 2⁵ = 565161529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (565161563) 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 in 5 ways as a sum of consecutive naturals, for example, 31397856 + ... + 31397873.

It is an arithmetic number, because the mean of its divisors is an integer number (136057415).

Almost surely, 2^565161561 is an apocalyptic number.

It is an amenable number.

565161561 is a deficient number, since it is larger than the sum of its proper divisors (251182929).

565161561 is a wasteful number, since it uses less digits than its factorization.

565161561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62795735 (or 62795732 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 565161561 is about 23773.1268662749. The cubic root of 565161561 is about 826.7817316383.

The spelling of 565161561 in words is "five hundred sixty-five million, one hundred sixty-one thousand, five hundred sixty-one".