Order By Hits Not Working

I’m trying to get the order by options for my shop and have all but one working – order by hits/view.

I have tried numerous queries:
– meta_key=hits&orderby=meta_value_num&order=desc
– meta_key=hits&orderby=meta_value&order=desc
– orderbyhits&order=desc

None of these seem to work.

Please help!!