16680218 has 16 divisors (see below), whose sum is σ = 25514880. Its totient is φ = 8176896.

The previous prime is 16680199. The next prime is 16680227. The reversal of 16680218 is 81208661.

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 7 ways as a sum of consecutive naturals, for example, 30221 + ... + 30767.

It is an arithmetic number, because the mean of its divisors is an integer number (1594680).

Almost surely, 2^16680218 is an apocalyptic number.

16680218 is a deficient number, since it is larger than the sum of its proper divisors (8834662).

16680218 is a wasteful number, since it uses less digits than its factorization.

16680218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 16680218 is about 4084.1422600101. The cubic root of 16680218 is about 255.5056888068.

Adding to 16680218 its reverse (81208661), we get a palindrome (97888879).

The spelling of 16680218 in words is "sixteen million, six hundred eighty thousand, two hundred eighteen".