218865855 has 16 divisors (see below), whose sum is σ = 377123040. Its totient is φ = 107749248.

The previous prime is 218865851. The next prime is 218865877. The reversal of 218865855 is 558568812.

It is not a de Polignac number, because 218865855 - 2² = 218865851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218865851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561000 + ... + 561389.

It is an arithmetic number, because the mean of its divisors is an integer number (23570190).

Almost surely, 2^218865855 is an apocalyptic number.

218865855 is a deficient number, since it is larger than the sum of its proper divisors (158257185).

218865855 is a wasteful number, since it uses less digits than its factorization.

218865855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122410.

The product of its digits is 768000, while the sum is 48.

The square root of 218865855 is about 14794.1155531515. The cubic root of 218865855 is about 602.6419194730.

The spelling of 218865855 in words is "two hundred eighteen million, eight hundred sixty-five thousand, eight hundred fifty-five".