2165855853 has 16 divisors (see below), whose sum is σ = 3301102080. Its totient is φ = 1237350576.

The previous prime is 2165855849. The next prime is 2165855893. The reversal of 2165855853 is 3585585612.

It is not a de Polignac number, because 2165855853 - 2² = 2165855849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165855893) by changing a digit.

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, 114418 + ... + 131996.

It is an arithmetic number, because the mean of its divisors is an integer number (206318880).

Almost surely, 2^2165855853 is an apocalyptic number.

It is an amenable number.

2165855853 is a deficient number, since it is larger than the sum of its proper divisors (1135246227).

2165855853 is a wasteful number, since it uses less digits than its factorization.

2165855853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23456.

The product of its digits is 1440000, while the sum is 48.

The square root of 2165855853 is about 46538.7564616847. The cubic root of 2165855853 is about 1293.8279130095.

The spelling of 2165855853 in words is "two billion, one hundred sixty-five million, eight hundred fifty-five thousand, eight hundred fifty-three".