56665555520 has 224 divisors, whose sum is σ = 160347720960. Its totient is φ = 18669404160.

The previous prime is 56665555519. The next prime is 56665555543. The reversal of 56665555520 is 2555556665.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6148676 + ... + 6157884.

It is an arithmetic number, because the mean of its divisors is an integer number (715838040).

Almost surely, 2^56665555520 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 56665555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80173860480).

56665555520 is an abundant number, since it is smaller than the sum of its proper divisors (103682165440).

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

56665555520 is a wasteful number, since it uses less digits than its factorization.

56665555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9341 (or 9331 counting only the distinct ones).

The product of its (nonzero) digits is 6750000, while the sum is 50.

The spelling of 56665555520 in words is "fifty-six billion, six hundred sixty-five million, five hundred fifty-five thousand, five hundred twenty".