16668818 has 8 divisors (see below), whose sum is σ = 25475148. Its totient is φ = 8177104.

The previous prime is 16668809. The next prime is 16668851. The reversal of 16668818 is 81886661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16024009 + 644809 = 4003^2 + 803^2 .

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

It is a Curzon 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, 78521 + ... + 78732.

Almost surely, 2^16668818 is an apocalyptic number.

16668818 is a deficient number, since it is larger than the sum of its proper divisors (8806330).

16668818 is a wasteful number, since it uses less digits than its factorization.

16668818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157308.

The product of its digits is 110592, while the sum is 44.

The square root of 16668818 is about 4082.7463795832. The cubic root of 16668818 is about 255.4474675718.

The spelling of 16668818 in words is "sixteen million, six hundred sixty-eight thousand, eight hundred eighteen".