565666565 has 4 divisors (see below), whose sum is σ = 678799884. Its totient is φ = 452533248.

The previous prime is 565666511. The next prime is 565666567.

It is a happy number.

565666565 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 434013889 + 131652676 = 20833^2 + 11474^2 .

It is a cyclic number.

It is not a de Polignac number, because 565666565 - 2⁶ = 565666501 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 (565666567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56566652 + ... + 56566661.

It is an arithmetic number, because the mean of its divisors is an integer number (169699971).

Almost surely, 2^565666565 is an apocalyptic number.

It is an amenable number.

565666565 is a deficient number, since it is larger than the sum of its proper divisors (113133319).

565666565 is a wasteful number, since it uses less digits than its factorization.

565666565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113133318.

The product of its digits is 4860000, while the sum is 50.

The square root of 565666565 is about 23783.7458151570. The cubic root of 565666565 is about 827.0279171602.

The spelling of 565666565 in words is "five hundred sixty-five million, six hundred sixty-six thousand, five hundred sixty-five".