I would like to know the 500 most visited websites and the number of
hits they receive each day/month/year.

You should subscribe to Nielsens-Netratings, http://www.netratings.com
which provides statistics on the most visited web sites on the web.

Statistics generally focus on unique visitors or page impressions
rather then hits, as the former two are more meaningful.
Free information available tends to only document the top 50 or 100
for unique visitors and generally on a regional basis.
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