561605565 has 16 divisors (see below), whose sum is σ = 901152000. Its totient is φ = 298661952.

The previous prime is 561605563. The next prime is 561605587. The reversal of 561605565 is 565506165.

It is not a de Polignac number, because 561605565 - 2¹ = 561605563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561605563) 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, 48405 + ... + 58874.

It is an arithmetic number, because the mean of its divisors is an integer number (56322000).

Almost surely, 2^561605565 is an apocalyptic number.

It is an amenable number.

561605565 is a deficient number, since it is larger than the sum of its proper divisors (339546435).

561605565 is a wasteful number, since it uses less digits than its factorization.

561605565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107636.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 561605565 is about 23698.2186039373. The cubic root of 561605565 is about 825.0440453987.

The spelling of 561605565 in words is "five hundred sixty-one million, six hundred five thousand, five hundred sixty-five".