How many movies has the highest networth actor acted in?
highest networth refers to max(networth)
SELECT COUNT(*) FROM characters AS T1 INNER JOIN actor AS T2 ON T1.ActorID = T2.ActorID WHERE CAST(REPLACE(REPLACE(T2.NetWorth, ',', ''), '$', '') AS REAL) = ( SELECT MAX(CAST(REPLACE(REPLACE(NetWorth, ',', ''), '$', '') AS REAL)) FROM actor)