55921625680 has 80 divisors (see below), whose sum is σ = 134653881600. Its totient is φ = 21572794880.

The previous prime is 55921625671. The next prime is 55921625707. The reversal of 55921625680 is 8652612955.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2100291 + ... + 2126749.

It is an arithmetic number, because the mean of its divisors is an integer number (1683173520).

Almost surely, 2^55921625680 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 55921625680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67326940800).

55921625680 is an abundant number, since it is smaller than the sum of its proper divisors (78732255920).

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

55921625680 is a wasteful number, since it uses less digits than its factorization.

55921625680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27412 (or 27406 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 55921625680 in words is "fifty-five billion, nine hundred twenty-one million, six hundred twenty-five thousand, six hundred eighty".