2185555812 has 96 divisors (see below), whose sum is σ = 5799736320. Its totient is φ = 634677120.

The previous prime is 2185555787. The next prime is 2185555829.

2185555812 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323889 + ... + 330567.

It is an arithmetic number, because the mean of its divisors is an integer number (60413920).

Almost surely, 2^2185555812 is an apocalyptic number.

2185555812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2185555812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2899868160).

2185555812 is an abundant number, since it is smaller than the sum of its proper divisors (3614180508).

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

2185555812 is a wasteful number, since it uses less digits than its factorization.

2185555812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801 (or 6799 counting only the distinct ones).

The product of its digits is 160000, while the sum is 42.

The square root of 2185555812 is about 46749.9284705335. The cubic root of 2185555812 is about 1297.7388330067.

The spelling of 2185555812 in words is "two billion, one hundred eighty-five million, five hundred fifty-five thousand, eight hundred twelve".