16662218 has 8 divisors (see below), whose sum is σ = 25046112. Its totient is φ = 8313516.

The previous prime is 16662203. The next prime is 16662229. The reversal of 16662218 is 81226661.

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

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, 7580 + ... + 9527.

It is an arithmetic number, because the mean of its divisors is an integer number (3130764).

Almost surely, 2^16662218 is an apocalyptic number.

16662218 is a deficient number, since it is larger than the sum of its proper divisors (8383894).

16662218 is a wasteful number, since it uses less digits than its factorization.

16662218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17596.

The product of its digits is 6912, while the sum is 32.

The square root of 16662218 is about 4081.9380201076. The cubic root of 16662218 is about 255.4137484073.

Adding to 16662218 its reverse (81226661), we get a palindrome (97888879).

The spelling of 16662218 in words is "sixteen million, six hundred sixty-two thousand, two hundred eighteen".