12 groups of order 636.
| SmallGroups | group |
|---|---|
| (636, 1) | Dic3×C53 #10597899 |
| (636, 2) | C3×Dic53 #10597900 |
| (636, 3) | Dic159 #10597901 |
| (636, 4) | C3×C4×C53 #10597902 |
| (636, 5) | C3×#6157 #10597903 |
| (636, 6) | C3⋊#6157 #10597904 |
| (636, 7) | D3×D53 #10597905 |
| (636, 8) | A4×C53 #10597906 |
| (636, 9) | C2×C3×D53 #10597907 |
| (636, 10) | C2×D3×C53 #10597908 |
| (636, 11) | C2×D159 #10597909 |
| (636, 12) | C22×C3×C53 #10597910 |