168

168 (one hundred [and] sixty-eight) is the natural number following 167 and preceding 169. It is the number of hours in a week, or 7 x 24 hours. 168 is the fourth Dedekind number,and the 128th composite number. 168 is the fourth Dedekind number, and one of sixty-five idoneal numbers. It is one less than a square (132), equal to the product of the first two perfect numbers.