55520323320 has 512 divisors, whose sum is σ = 219370291200. Its totient is φ = 10890547200.

The previous prime is 55520323279. The next prime is 55520323387. The reversal of 55520323320 is 2332302555.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 91466457 + ... + 91467063.

It is an arithmetic number, because the mean of its divisors is an integer number (428457600).

Almost surely, 2^55520323320 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 55520323320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109685145600).

55520323320 is an abundant number, since it is smaller than the sum of its proper divisors (163849967880).

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

55520323320 is a wasteful number, since it uses less digits than its factorization.

55520323320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1175 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 30.

Adding to 55520323320 its reverse (2332302555), we get a palindrome (57852625875).

The spelling of 55520323320 in words is "fifty-five billion, five hundred twenty million, three hundred twenty-three thousand, three hundred twenty".