2165441899 has 4 divisors (see below), whose sum is σ = 2172273264. Its totient is φ = 2158610536.

The previous prime is 2165441897. The next prime is 2165441923. The reversal of 2165441899 is 9981445612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2165441899 - 2¹ = 2165441897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165441897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3415207 + ... + 3415840.

It is an arithmetic number, because the mean of its divisors is an integer number (543068316).

Almost surely, 2^2165441899 is an apocalyptic number.

2165441899 is a deficient number, since it is larger than the sum of its proper divisors (6831365).

2165441899 is an equidigital number, since it uses as much as digits as its factorization.

2165441899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6831364.

The product of its digits is 622080, while the sum is 49.

The square root of 2165441899 is about 46534.3088376737. The cubic root of 2165441899 is about 1293.7454791817.

The spelling of 2165441899 in words is "two billion, one hundred sixty-five million, four hundred forty-one thousand, eight hundred ninety-nine".