2185128552 has 16 divisors (see below), whose sum is σ = 5462821440. Its totient is φ = 728376176.

The previous prime is 2185128523. The next prime is 2185128563. The reversal of 2185128552 is 2558215812.

It is a self number, because there is not a number n which added to its sum of digits gives 2185128552.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45523488 + ... + 45523535.

It is an arithmetic number, because the mean of its divisors is an integer number (341426340).

Almost surely, 2^2185128552 is an apocalyptic number.

It is an amenable number.

2185128552 is an abundant number, since it is smaller than the sum of its proper divisors (3277692888).

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

2185128552 is a wasteful number, since it uses less digits than its factorization.

2185128552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91047032 (or 91047028 counting only the distinct ones).

The product of its digits is 64000, while the sum is 39.

The square root of 2185128552 is about 46745.3586145192. The cubic root of 2185128552 is about 1297.6542613802.

It can be divided in two parts, 21851 and 28552, that added together give a triangular number (50403 = T₃₁₇).

The spelling of 2185128552 in words is "two billion, one hundred eighty-five million, one hundred twenty-eight thousand, five hundred fifty-two".