218118668 has 12 divisors (see below), whose sum is σ = 384622392. Its totient is φ = 108226560.

The previous prime is 218118629. The next prime is 218118679. The reversal of 218118668 is 866811812.

218118668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207605 + ... + 208652.

It is an arithmetic number, because the mean of its divisors is an integer number (32051866).

Almost surely, 2^218118668 is an apocalyptic number.

It is an amenable number.

218118668 is a deficient number, since it is larger than the sum of its proper divisors (166503724).

218118668 is a wasteful number, since it uses less digits than its factorization.

218118668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416392 (or 416390 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 218118668 is about 14768.8411190587. The cubic root of 218118668 is about 601.9553503821.

The spelling of 218118668 in words is "two hundred eighteen million, one hundred eighteen thousand, six hundred sixty-eight".