In what year did Lyndon B. Johnson first take office as President?

Which number president was Lyndon B. Johnson? Who succeeded Lyndon B. Johnson as President of the United States? Which political party did President Lyndon B. Johnson belong to? Which president served from 1963 to 1969? 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?