Which number president was Richard Nixon?

Who served as Vice President under Lyndon B. Johnson? Under which president did Hubert Humphrey serve as Vice President? Who was First Lady during Lyndon B. Johnson's presidency? Lady Bird Johnson was married to which president? Who succeeded Richard Nixon as President of the United States? Who was President immediately before Richard Nixon? Which political party did President Richard Nixon belong to? Which president served from 1969 to 1974?