561055660 has 24 divisors (see below), whose sum is σ = 1285328016. Its totient is φ = 204020160.

The previous prime is 561055643. The next prime is 561055661. The reversal of 561055660 is 66550165.

It is not an unprimeable number, because it can be changed into a prime (561055661) by changing a digit.

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, 1274907 + ... + 1275346.

It is an arithmetic number, because the mean of its divisors is an integer number (53555334).

Almost surely, 2^561055660 is an apocalyptic number.

It is an amenable number.

561055660 is an abundant number, since it is smaller than the sum of its proper divisors (724272356).

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

561055660 is a wasteful number, since it uses less digits than its factorization.

561055660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550273 (or 2550271 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 561055660 is about 23686.6135190322. The cubic root of 561055660 is about 824.7746724699.

The spelling of 561055660 in words is "five hundred sixty-one million, fifty-five thousand, six hundred sixty".