55163223720 has 256 divisors, whose sum is σ = 200821420800. Its totient is φ = 13357716480.

The previous prime is 55163223707. The next prime is 55163223751. The reversal of 55163223720 is 2732236155.

55163223720 is a `hidden beast` number, since 551 + 6 + 32 + 2 + 3 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13267882 + ... + 13272038.

It is an arithmetic number, because the mean of its divisors is an integer number (784458675).

Almost surely, 2^55163223720 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 55163223720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100410710400).

55163223720 is an abundant number, since it is smaller than the sum of its proper divisors (145658197080).

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

55163223720 is a wasteful number, since it uses less digits than its factorization.

55163223720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305 (or 5295 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

Adding to 55163223720 its reverse (2732236155), we get a palindrome (57895459875).

The spelling of 55163223720 in words is "fifty-five billion, one hundred sixty-three million, two hundred twenty-three thousand, seven hundred twenty".