Which number president was Zachary Taylor?

Who served as Vice President under James K. Polk? Under which president did George M. Dallas serve as Vice President? Who was First Lady during James K. Polk's presidency? Sarah Polk was married to which president? Who succeeded Zachary Taylor as President of the United States? Who was President immediately before Zachary Taylor? Which political party did President Zachary Taylor belong to? Which president served from 1849 to 1850?