2185645660 has 48 divisors (see below), whose sum is σ = 5017324032. Its totient is φ = 793160000.

The previous prime is 2185645621. The next prime is 2185645673. The reversal of 2185645660 is 665465812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100785 + ... + 120535.

It is an arithmetic number, because the mean of its divisors is an integer number (104527584).

Almost surely, 2^2185645660 is an apocalyptic number.

2185645660 is a gapful number since it is divisible by the number (20) 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 2185645660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2508662016).

2185645660 is an abundant number, since it is smaller than the sum of its proper divisors (2831678372).

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

2185645660 is a wasteful number, since it uses less digits than its factorization.

2185645660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20274 (or 20272 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 2185645660 is about 46750.8894033044. The cubic root of 2185645660 is about 1297.7566160714.

The spelling of 2185645660 in words is "two billion, one hundred eighty-five million, six hundred forty-five thousand, six hundred sixty".