56561357580 has 864 divisors, whose sum is σ = 217299511296. Its totient is φ = 10870142976.

The previous prime is 56561357497. The next prime is 56561357591. The reversal of 56561357580 is 8575316565.

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 287 ways as a sum of consecutive naturals, for example, 1203433117 + ... + 1203433163.

It is an arithmetic number, because the mean of its divisors is an integer number (251504064).

Almost surely, 2^56561357580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56561357580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108649755648).

56561357580 is an abundant number, since it is smaller than the sum of its proper divisors (160738153716).

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

56561357580 is a wasteful number, since it uses less digits than its factorization.

56561357580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 3780000, while the sum is 51.

The spelling of 56561357580 in words is "fifty-six billion, five hundred sixty-one million, three hundred fifty-seven thousand, five hundred eighty".