( 2 \* 5 \* 5 = 50 ) The factors of 50 are 1,2,5,10,25,50 . 50 is the smallest number that can be written as the sum of two squares in two distinct ways , Also , 50 is one-half of 100 or half of a century ( a century is 100 years ) 50 = 12 +72 = 52 +52 For the year 50 CE , see 50 .