561565165 has 64 divisors (see below), whose sum is σ = 853991424. Its totient is φ = 345719808.

The previous prime is 561565163. The next prime is 561565181.

561565165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 561565165 - 2¹ = 561565163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561565163) 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 63 ways as a sum of consecutive naturals, for example, 1202262 + ... + 1202728.

It is an arithmetic number, because the mean of its divisors is an integer number (13343616).

Almost surely, 2^561565165 is an apocalyptic number.

It is an amenable number.

561565165 is a deficient number, since it is larger than the sum of its proper divisors (292426259).

561565165 is a wasteful number, since it uses less digits than its factorization.

561565165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

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

The square root of 561565165 is about 23697.3662038632. The cubic root of 561565165 is about 825.0242613006.

The spelling of 561565165 in words is "five hundred sixty-one million, five hundred sixty-five thousand, one hundred sixty-five".