561566605 has 8 divisors (see below), whose sum is σ = 675417600. Its totient is φ = 448228176.

The previous prime is 561566573. The next prime is 561566617. The reversal of 561566605 is 506665165.

561566605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561566605 - 2⁵ = 561566573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125725 + ... + 130114.

It is an arithmetic number, because the mean of its divisors is an integer number (84427200).

Almost surely, 2^561566605 is an apocalyptic number.

It is an amenable number.

561566605 is a deficient number, since it is larger than the sum of its proper divisors (113850995).

561566605 is a wasteful number, since it uses less digits than its factorization.

561566605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256283.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 561566605 is about 23697.3965869671. The cubic root of 561566605 is about 825.0249664927.

The spelling of 561566605 in words is "five hundred sixty-one million, five hundred sixty-six thousand, six hundred five".