55821726720 has 264 divisors, whose sum is σ = 200589034464. Its totient is φ = 14885462016.

The previous prime is 55821726679. The next prime is 55821726721. The reversal of 55821726720 is 2762712855.

55821726720 is a `hidden beast` number, since 5 + 582 + 1 + 7 + 2 + 67 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55821726721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1221727 + ... + 1266593.

Almost surely, 2^55821726720 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 55821726720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100294517232).

55821726720 is an abundant number, since it is smaller than the sum of its proper divisors (144767307744).

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

55821726720 is an equidigital number, since it uses as much as digits as its factorization.

55821726720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44907 (or 44877 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 55821726720 in words is "fifty-five billion, eight hundred twenty-one million, seven hundred twenty-six thousand, seven hundred twenty".