16668194 has 8 divisors (see below), whose sum is σ = 26473068. Its totient is φ = 7843840.

The previous prime is 16668137. The next prime is 16668209. The reversal of 16668194 is 49186661.

It can be written as a sum of positive squares in 2 ways, for example, as 15642025 + 1026169 = 3955^2 + 1013^2 .

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, 245087 + ... + 245154.

Almost surely, 2^16668194 is an apocalyptic number.

16668194 is a deficient number, since it is larger than the sum of its proper divisors (9804874).

16668194 is a wasteful number, since it uses less digits than its factorization.

16668194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490260.

The product of its digits is 62208, while the sum is 41.

The square root of 16668194 is about 4082.6699597200. The cubic root of 16668194 is about 255.4442799591. Note that the first 3 decimals are identical.

The spelling of 16668194 in words is "sixteen million, six hundred sixty-eight thousand, one hundred ninety-four".