561105556 has 36 divisors (see below), whose sum is σ = 1081360224. Its totient is φ = 254565520.

The previous prime is 561105551. The next prime is 561105569. The reversal of 561105556 is 655501165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561105551) 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 11 ways as a sum of consecutive naturals, for example, 428655 + ... + 429961.

It is an arithmetic number, because the mean of its divisors is an integer number (30037784).

Almost surely, 2^561105556 is an apocalyptic number.

It is an amenable number.

561105556 is a deficient number, since it is larger than the sum of its proper divisors (520254668).

561105556 is a wasteful number, since it uses less digits than its factorization.

561105556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220 (or 2207 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 561105556 is about 23687.6667487535. Note that the first 3 decimals coincide. The cubic root of 561105556 is about 824.7991214626.

The spelling of 561105556 in words is "five hundred sixty-one million, one hundred five thousand, five hundred fifty-six".