56121683280 has 320 divisors, whose sum is σ = 194040913920. Its totient is φ = 13324953600.

The previous prime is 56121683273. The next prime is 56121683377. The reversal of 56121683280 is 8238612165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36656115 + ... + 36657645.

It is an arithmetic number, because the mean of its divisors is an integer number (606377856).

Almost surely, 2^56121683280 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 56121683280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97020456960).

56121683280 is an abundant number, since it is smaller than the sum of its proper divisors (137919230640).

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

56121683280 is a wasteful number, since it uses less digits than its factorization.

56121683280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 56121683280 in words is "fifty-six billion, one hundred twenty-one million, six hundred eighty-three thousand, two hundred eighty".