566888561 has 4 divisors (see below), whose sum is σ = 570020724. Its totient is φ = 563756400.

The previous prime is 566888551. The next prime is 566888563. The reversal of 566888561 is 165888665.

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 276390625 + 290497936 = 16625^2 + 17044^2 .

It is a cyclic number.

It is not a de Polignac number, because 566888561 - 2¹⁰ = 566887537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566888563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565810 + ... + 1566171.

It is an arithmetic number, because the mean of its divisors is an integer number (142505181).

Almost surely, 2^566888561 is an apocalyptic number.

It is an amenable number.

566888561 is a deficient number, since it is larger than the sum of its proper divisors (3132163).

566888561 is a wasteful number, since it uses less digits than its factorization.

566888561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132162.

The product of its digits is 2764800, while the sum is 53.

The square root of 566888561 is about 23809.4216855429. The cubic root of 566888561 is about 827.6230250667.

The spelling of 566888561 in words is "five hundred sixty-six million, eight hundred eighty-eight thousand, five hundred sixty-one".