How many movies have Chittoor V. Nagayya and M. S. Viswanathan collaborated on?

They have worked on 18 movies together! Their first movie together was Tenali Raman (1956) while their highest rated movie together was Paava Mannippu (1961). They have not worked together since Ennai Pol Oruvan (1978). They are most known for their drama films together.