55120520520 has 256 divisors, whose sum is σ = 209508768000. Its totient is φ = 12769947648.

The previous prime is 55120520519. The next prime is 55120520561. The reversal of 55120520520 is 2502502155.

It is a Harshad number since it is a multiple of its sum of digits (27).

55120520520 is a modest number, since divided by 520520 gives 55120 as remainder.

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, 123211 + ... + 354149.

It is an arithmetic number, because the mean of its divisors is an integer number (818393625).

Almost surely, 2^55120520520 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 55120520520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104754384000).

55120520520 is an abundant number, since it is smaller than the sum of its proper divisors (154388247480).

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

55120520520 is a wasteful number, since it uses less digits than its factorization.

55120520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230989 (or 230979 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

It can be divided in two parts, 55 and 120520520, that added together give a triangular number (120520575 = T₁₅₅₂₅).

The spelling of 55120520520 in words is "fifty-five billion, one hundred twenty million, five hundred twenty thousand, five hundred twenty".