218218218 has 16 divisors (see below), whose sum is σ = 440441760. Its totient is φ = 72071856.

The previous prime is 218218213. The next prime is 218218241. The reversal of 218218218 is 812812812.

218218218 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

218218218 is a modest number, since divided by 218218 gives 218 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218218213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166180 + ... + 167487.

It is an arithmetic number, because the mean of its divisors is an integer number (27527610).

Almost surely, 2^218218218 is an apocalyptic number.

218218218 is an abundant number, since it is smaller than the sum of its proper divisors (222223542).

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

218218218 is a wasteful number, since it uses less digits than its factorization.

218218218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333781.

The product of its digits is 4096, while the sum is 33.

The square root of 218218218 is about 14772.2110058041. The cubic root of 218218218 is about 602.0469145162.

The spelling of 218218218 in words is "two hundred eighteen million, two hundred eighteen thousand, two hundred eighteen".