561566516 has 24 divisors (see below), whose sum is σ = 1138522560. Its totient is φ = 237373632.

The previous prime is 561566507. The next prime is 561566521. The reversal of 561566516 is 615665165.

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, 135326 + ... + 139413.

It is an arithmetic number, because the mean of its divisors is an integer number (47438440).

Almost surely, 2^561566516 is an apocalyptic number.

It is an amenable number.

561566516 is an abundant number, since it is smaller than the sum of its proper divisors (576956044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561566516 is a wasteful number, since it uses less digits than its factorization.

561566516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274823 (or 274821 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The square root of 561566516 is about 23697.3947091236. The cubic root of 561566516 is about 825.0249229079.

The spelling of 561566516 in words is "five hundred sixty-one million, five hundred sixty-six thousand, five hundred sixteen".