561506660 has 48 divisors (see below), whose sum is σ = 1385318592. Its totient is φ = 188476800.

The previous prime is 561506657. The next prime is 561506723. The reversal of 561506660 is 66605165.

It is a self number, because there is not a number n which added to its sum of digits gives 561506660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95306 + ... + 101025.

It is an arithmetic number, because the mean of its divisors is an integer number (28860804).

Almost surely, 2^561506660 is an apocalyptic number.

It is an amenable number.

561506660 is an abundant number, since it is smaller than the sum of its proper divisors (823811932).

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

561506660 is a wasteful number, since it uses less digits than its factorization.

561506660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196364 (or 196362 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 561506660 is about 23696.1317518282. The cubic root of 561506660 is about 824.9956094042.

The spelling of 561506660 in words is "five hundred sixty-one million, five hundred six thousand, six hundred sixty".