LDS/Mormons: why and how do you consider your church's president to be a prophet?

I'm Catholic, and in feuding (jokingly, of course) with a Mormon friend I was told that Thomas S. Monson should be more revered than the Pope because he is more than just a president--he is also a prophet. Can somebody explain this belief to me? How is it similar or dissimilar to the doctrine of apostolic... show more I'm Catholic, and in feuding (jokingly, of course) with a Mormon friend I was told that Thomas S. Monson should be more revered than the Pope because he is more than just a president--he is also a prophet.

Can somebody explain this belief to me? How is it similar or dissimilar to the doctrine of apostolic succession which gives the Pope of the Catholic Church his authority?
Update: *apostolic succession and papal infallibility
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