What are the odds of a perfect #MarchMadness bracket?

What are the odds of a perfect March Madness bracket?

Answer

So small, in fact, that many mathematicians differ on the actual estimation of the odds. Some believe it’s as low as 1 in 9,223,372,036,854,775,808 (or 1 in 9.2quintillion, for those who skipped the last 18 digits), while others, including Jeff Bergen, a professor at DePaul, think it’s as “high” as 1 in 128 billion.

Source 

http://www.ncaa.com/news/basketball-men/bracket-beat/2016-03-14/march-madness-7-things-more-likely-happen-picking

Why did this come up

March Madness begins