2165318518 has 8 divisors (see below), whose sum is σ = 3543248520. Its totient is φ = 984235680.

The previous prime is 2165318513. The next prime is 2165318521. The reversal of 2165318518 is 8158135612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165318513) 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, 49211763 + ... + 49211806.

It is an arithmetic number, because the mean of its divisors is an integer number (442906065).

Almost surely, 2^2165318518 is an apocalyptic number.

2165318518 is a deficient number, since it is larger than the sum of its proper divisors (1377930002).

2165318518 is a wasteful number, since it uses less digits than its factorization.

2165318518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98423582.

The product of its digits is 57600, while the sum is 40.

The square root of 2165318518 is about 46532.9831195035. The cubic root of 2165318518 is about 1293.7209073468.

The spelling of 2165318518 in words is "two billion, one hundred sixty-five million, three hundred eighteen thousand, five hundred eighteen".