a factor tree is this= 66 / \ 6 • 11 / \ 2 •3
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2 There's no formula. Just divide your number and its factors by prime numbers until all the factors are prime.
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2
66 33*22 11*6
YES
the answer i think is 2,3 or 2 and 11 hope i helped :).