55729969920 has 216 divisors, whose sum is σ = 199962484176. Its totient is φ = 14861242368.

The previous prime is 55729969847. The next prime is 55729969931. The reversal of 55729969920 is 2996992755.

55729969920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (216).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 221454 + ... + 400626.

Almost surely, 2^55729969920 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 55729969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99981242088).

55729969920 is an abundant number, since it is smaller than the sum of its proper divisors (144232514256).

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

55729969920 is an equidigital number, since it uses as much as digits as its factorization.

55729969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179209 (or 179183 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 63.

The spelling of 55729969920 in words is "fifty-five billion, seven hundred twenty-nine million, nine hundred sixty-nine thousand, nine hundred twenty".