566165561 has 4 divisors (see below), whose sum is σ = 609716772. Its totient is φ = 522614352.

The previous prime is 566165549. The next prime is 566165627. The reversal of 566165561 is 165561665.

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 150209536 + 415956025 = 12256^2 + 20395^2 .

It is not a de Polignac number, because 566165561 - 2⁶ = 566165497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566165261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21775586 + ... + 21775611.

It is an arithmetic number, because the mean of its divisors is an integer number (152429193).

Almost surely, 2^566165561 is an apocalyptic number.

It is an amenable number.

566165561 is a deficient number, since it is larger than the sum of its proper divisors (43551211).

566165561 is a wasteful number, since it uses less digits than its factorization.

566165561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43551210.

The product of its digits is 162000, while the sum is 41.

The square root of 566165561 is about 23794.2337762745. The cubic root of 566165561 is about 827.2710299523.

The spelling of 566165561 in words is "five hundred sixty-six million, one hundred sixty-five thousand, five hundred sixty-one".