56561205560 has 32 divisors (see below), whose sum is σ = 127455886800. Its totient is φ = 22590140160.

The previous prime is 56561205517. The next prime is 56561205581. The reversal of 56561205560 is 6550216565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046501 + ... + 1099220.

Almost surely, 2^56561205560 is an apocalyptic number.

It is an amenable number.

56561205560 is an abundant number, since it is smaller than the sum of its proper divisors (70894681240).

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

56561205560 is a wasteful number, since it uses less digits than its factorization.

56561205560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146391 (or 2146387 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 56561205560 in words is "fifty-six billion, five hundred sixty-one million, two hundred five thousand, five hundred sixty".