66
33,2
11,3,2
61 is already prime. It doesn't need a tree.
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2
66 33,2 11,3,2
44 22,2 11,2,2
52 26,2 13,2,2
66 33*22 11*6
1105 221,5 17,13,5
66 33,2 11,3,2 2 x 3 x 11 = 66
the answer i think is 2,3 or 2 and 11 hope i helped :).
A commonly used factor tree for 132 is: 132 11 12 11 4 3 11 2 4 3 Another factor tree for 132 is: 132 66 2 22 3 2 11 2 3 2 Yet another factor tree for 132 is: 132 66 2 33 2 2 11 3 2 2 Hey for the first factor tree 4 isn't prime