13218666 has 8 divisors (see below), whose sum is σ = 26437344. Its totient is φ = 4406220.

The previous prime is 13218659. The next prime is 13218671. The reversal of 13218666 is 66681231.

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

13218666 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101550 + ... + 1101561.

It is an arithmetic number, because the mean of its divisors is an integer number (3304668).

Almost surely, 2^13218666 is an apocalyptic number.

13218666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13218666 is a wasteful number, since it uses less digits than its factorization.

13218666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203116.

The product of its digits is 10368, while the sum is 33.

The square root of 13218666 is about 3635.7483411259. The cubic root of 13218666 is about 236.4444964784. Note that the first 4 decimals are identical.

Adding to 13218666 its reverse (66681231), we get a palindrome (79899897).

The spelling of 13218666 in words is "thirteen million, two hundred eighteen thousand, six hundred sixty-six".