566545561 has 4 divisors (see below), whose sum is σ = 569710800. Its totient is φ = 563380324.

The previous prime is 566545559. The next prime is 566545571. The reversal of 566545561 is 165545665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 566545561 - 2¹ = 566545559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566545571) 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, 1582351 + ... + 1582708.

It is an arithmetic number, because the mean of its divisors is an integer number (142427700).

Almost surely, 2^566545561 is an apocalyptic number.

It is an amenable number.

566545561 is a deficient number, since it is larger than the sum of its proper divisors (3165239).

566545561 is a wasteful number, since it uses less digits than its factorization.

566545561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165238.

The product of its digits is 540000, while the sum is 43.

The square root of 566545561 is about 23802.2175647564. The cubic root of 566545561 is about 827.4560716360.

The spelling of 566545561 in words is "five hundred sixty-six million, five hundred forty-five thousand, five hundred sixty-one".