55380049920 has 768 divisors, whose sum is σ = 216410201280. Its totient is φ = 13504610304.

The previous prime is 55380049919. The next prime is 55380049943. The reversal of 55380049920 is 2994008355.

55380049920 is a `hidden beast` number, since 5 + 538 + 0 + 0 + 4 + 99 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 517570507 + ... + 517570613.

Almost surely, 2^55380049920 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 55380049920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108205100640).

55380049920 is an abundant number, since it is smaller than the sum of its proper divisors (161030151360).

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

55380049920 is an equidigital number, since it uses as much as digits as its factorization.

55380049920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 55380049920 in words is "fifty-five billion, three hundred eighty million, forty-nine thousand, nine hundred twenty".