565166009 has 4 divisors (see below), whose sum is σ = 580440804. Its totient is φ = 549891216.

The previous prime is 565165973. The next prime is 565166029. The reversal of 565166009 is 900661565.

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 223951225 + 341214784 = 14965^2 + 18472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-565166009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (565166029) 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, 7637342 + ... + 7637415.

It is an arithmetic number, because the mean of its divisors is an integer number (145110201).

Almost surely, 2^565166009 is an apocalyptic number.

It is an amenable number.

565166009 is a deficient number, since it is larger than the sum of its proper divisors (15274795).

565166009 is a wasteful number, since it uses less digits than its factorization.

565166009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15274794.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 565166009 is about 23773.2204170996. The cubic root of 565166009 is about 826.7839006437.

The spelling of 565166009 in words is "five hundred sixty-five million, one hundred sixty-six thousand, nine".