2165868544 has 96 divisors (see below), whose sum is σ = 5241075840. Its totient is φ = 873529344.

The previous prime is 2165868499. The next prime is 2165868557. The reversal of 2165868544 is 4458685612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239269 + ... + 248155.

It is an arithmetic number, because the mean of its divisors is an integer number (54594540).

Almost surely, 2^2165868544 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 2165868544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620537920).

2165868544 is an abundant number, since it is smaller than the sum of its proper divisors (3075207296).

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

2165868544 is an equidigital number, since it uses as much as digits as its factorization.

2165868544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8933 (or 8913 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 49.

The square root of 2165868544 is about 46538.8928102077. The cubic root of 2165868544 is about 1293.8304400995.

The spelling of 2165868544 in words is "two billion, one hundred sixty-five million, eight hundred sixty-eight thousand, five hundred forty-four".