Common factors of 660 and 1155?

1,2,3,4,5,6,10,11,12,15,20,22,30,33,44,55,60,66,110,132,165,220,330,660

1,3,5,7,11,15,21,33,35,55,77,105,165,231,385,1155

Common set:

1,3,5,11,33,55,165