565656161 has 16 divisors (see below), whose sum is σ = 651750528. Its totient is φ = 480902400.

The previous prime is 565656137. The next prime is 565656167. The reversal of 565656161 is 161656565.

565656161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 565656161 - 2¹⁸ = 565394017 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (565656167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557891 + ... + 558903.

It is an arithmetic number, because the mean of its divisors is an integer number (40734408).

Almost surely, 2^565656161 is an apocalyptic number.

It is an amenable number.

565656161 is a deficient number, since it is larger than the sum of its proper divisors (86094367).

565656161 is a wasteful number, since it uses less digits than its factorization.

565656161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its digits is 162000, while the sum is 41.

The square root of 565656161 is about 23783.5270933476. The cubic root of 565656161 is about 827.0228467697.

It can be divided in two parts, 56565 and 6161, that added together give a palindrome (62726).

The spelling of 565656161 in words is "five hundred sixty-five million, six hundred fifty-six thousand, one hundred sixty-one".