168

168 = 2³ x 3 x 7.

168 has a unique representation as a sum of three squares: 168 = 2² + 8² + 10².

168 is the number of primes less than 1,000.

144,648 = 861 x 168 = 492 x 294.

168 is the total number of spots on a standard (double-6) set of dominoes.

168 is the number of hours in a week.

Source: Number Gossip