165218518213 has 8 divisors (see below), whose sum is σ = 190690680960. Its totient is φ = 140213734800.

The previous prime is 165218518163. The next prime is 165218518219. The reversal of 165218518213 is 312815812561.

165218518213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 165218518213 - 2⁹ = 165218517701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165218518213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165218518219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116844073 + ... + 116845486.

It is an arithmetic number, because the mean of its divisors is an integer number (23836335120).

Almost surely, 2^165218518213 is an apocalyptic number.

It is an amenable number.

165218518213 is a deficient number, since it is larger than the sum of its proper divisors (25472162747).

165218518213 is a wasteful number, since it uses less digits than its factorization.

165218518213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233689667.

The product of its digits is 115200, while the sum is 43.

The spelling of 165218518213 in words is "one hundred sixty-five billion, two hundred eighteen million, five hundred eighteen thousand, two hundred thirteen".