561716566 has 4 divisors (see below), whose sum is σ = 842574852. Its totient is φ = 280858282.

The previous prime is 561716563. The next prime is 561716579. The reversal of 561716566 is 665617165.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561716563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140429140 + ... + 140429143.

It is an arithmetic number, because the mean of its divisors is an integer number (210643713).

Almost surely, 2^561716566 is an apocalyptic number.

561716566 is a deficient number, since it is larger than the sum of its proper divisors (280858286).

561716566 is a wasteful number, since it uses less digits than its factorization.

561716566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280858285.

The product of its digits is 226800, while the sum is 43.

The square root of 561716566 is about 23700.5604575082. The cubic root of 561716566 is about 825.0983983033.

The spelling of 561716566 in words is "five hundred sixty-one million, seven hundred sixteen thousand, five hundred sixty-six".