561535656 has 32 divisors (see below), whose sum is σ = 1531461600. Its totient is φ = 170162240.

The previous prime is 561535573. The next prime is 561535661. The reversal of 561535656 is 656535165.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1063251 + ... + 1063778.

It is an arithmetic number, because the mean of its divisors is an integer number (47858175).

Almost surely, 2^561535656 is an apocalyptic number.

It is an amenable number.

561535656 is an abundant number, since it is smaller than the sum of its proper divisors (969925944).

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

561535656 is a wasteful number, since it uses less digits than its factorization.

561535656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127049 (or 2127045 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The square root of 561535656 is about 23696.7435737487. The cubic root of 561535656 is about 825.0098099844.

The spelling of 561535656 in words is "five hundred sixty-one million, five hundred thirty-five thousand, six hundred fifty-six".