12 groups of order 1644.
| SmallGroups | group |
|---|---|
| (1644, 1) | Dic3×C137 #13110038 |
| (1644, 2) | C3×Dic137 #13110039 |
| (1644, 3) | Dic411 #13110040 |
| (1644, 4) | C3×C4×C137 #13110041 |
| (1644, 5) | C3×#10587739 #13110042 |
| (1644, 6) | C3⋊#10587739 #13110043 |
| (1644, 7) | D3×D137 #13110044 |
| (1644, 8) | A4×C137 #13110045 |
| (1644, 9) | C2×C3×D137 #13110046 |
| (1644, 10) | C2×D3×C137 #13110047 |
| (1644, 11) | C2×D411 #13110048 |
| (1644, 12) | C22×C3×C137 #13110049 |