How many movies have Nanabhai Bhatt and Suman Kalyanpur collaborated on?

They have worked on 3 movies together! Their first movie together was Mr. X (1957) while their highest rated movie together was Aadhi Raat Ke Baad (1965). They have not worked together since Aadhi Raat Ke Baad (1965). They are most known for their science fiction films together.