566705661 has 4 divisors (see below), whose sum is σ = 755607552. Its totient is φ = 377803772.

The previous prime is 566705651. The next prime is 566705669. The reversal of 566705661 is 166507665.

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 566705661 - 2¹⁵ = 566672893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566705669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94450941 + ... + 94450946.

It is an arithmetic number, because the mean of its divisors is an integer number (188901888).

Almost surely, 2^566705661 is an apocalyptic number.

It is an amenable number.

566705661 is a deficient number, since it is larger than the sum of its proper divisors (188901891).

566705661 is a wasteful number, since it uses less digits than its factorization.

566705661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188901890.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 566705661 is about 23805.5804592117. The cubic root of 566705661 is about 827.5340078453.

The spelling of 566705661 in words is "five hundred sixty-six million, seven hundred five thousand, six hundred sixty-one".