10 groups of order 1666.
| SmallGroups | group |
|---|---|
| (1666, 1) | C17×D49 #13131839 |
| (1666, 2) | D17×C49 #13131840 |
| (1666, 3) | D833 #13131841 |
| (1666, 4) | C2×C17×C49 #13131842 |
| (1666, 5) | C72×D17 #13131843 |
| (1666, 6) | C7×D7×C17 #13131844 |
| (1666, 7) | C7×D119 #13131845 |
| (1666, 8) | C17×C7⋊D7 #13131846 |
| (1666, 9) | C7⋊D119 #13131847 |
| (1666, 10) | C2×C72×C17 #13131848 |