66 flop a gut draw but there is a flush on board.

[Schizo]

.5/1

Hero has 6s6c and is in SB
6 limpers, I call 1/2SB, BB raises everyone calls.

Flop (16 SB, 8 players)

Flop comes 579 with 2 diamonds.

What are the pot odd that I need to call? I know I now have 4 outs (not including 5,6 diamonds). Which means that 47/4 = 11.75:1 is the pot odds I need to call. Is this the best way to go about it? Can I count any of those diamonds as outs?