561606165 has 24 divisors (see below), whose sum is σ = 999763128. Its totient is φ = 291427200.

The previous prime is 561606163. The next prime is 561606167.

561606165 is nontrivially palindromic in base 10.

561606165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561606163) and next prime (561606167).

It can be written as a sum of positive squares in 4 ways, for example, as 149597361 + 412008804 = 12231^2 + 20298^2 .

It is not a de Polignac number, because 561606165 - 2¹ = 561606163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561606163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166986 + ... + 170315.

It is an arithmetic number, because the mean of its divisors is an integer number (41656797).

Almost surely, 2^561606165 is an apocalyptic number.

It is an amenable number.

561606165 is a deficient number, since it is larger than the sum of its proper divisors (438156963).

561606165 is a wasteful number, since it uses less digits than its factorization.

561606165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337349 (or 337346 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 561606165 is about 23698.2312631133. The cubic root of 561606165 is about 825.0443392148.

The spelling of 561606165 in words is "five hundred sixty-one million, six hundred six thousand, one hundred sixty-five".