218116906 has 8 divisors (see below), whose sum is σ = 373914720. Its totient is φ = 93478668.

The previous prime is 218116901. The next prime is 218116909. The reversal of 218116906 is 609611812.

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

It is not an unprimeable number, because it can be changed into a prime (218116901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7789876 + ... + 7789903.

It is an arithmetic number, because the mean of its divisors is an integer number (46739340).

Almost surely, 2^218116906 is an apocalyptic number.

218116906 is a deficient number, since it is larger than the sum of its proper divisors (155797814).

218116906 is a wasteful number, since it uses less digits than its factorization.

218116906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15579788.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 218116906 is about 14768.7814663228. The cubic root of 218116906 is about 601.9537294783.

The spelling of 218116906 in words is "two hundred eighteen million, one hundred sixteen thousand, nine hundred six".