565323661 has 32 divisors (see below), whose sum is σ = 710525952. Its totient is φ = 438773760.

The previous prime is 565323653. The next prime is 565323667. The reversal of 565323661 is 166323565.

It is a cyclic number.

It is not a de Polignac number, because 565323661 - 2³ = 565323653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 565323661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565323667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340345 + ... + 342001.

It is an arithmetic number, because the mean of its divisors is an integer number (22203936).

Almost surely, 2^565323661 is an apocalyptic number.

It is an amenable number.

565323661 is a deficient number, since it is larger than the sum of its proper divisors (145202291).

565323661 is a wasteful number, since it uses less digits than its factorization.

565323661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789.

The product of its digits is 97200, while the sum is 37.

The square root of 565323661 is about 23776.5359335627. The cubic root of 565323661 is about 826.8607701036.

The spelling of 565323661 in words is "five hundred sixty-five million, three hundred twenty-three thousand, six hundred sixty-one".