There are 9,223,372,036,854,775,808 possible brackets. That’s the number nine follow by eighteen zeros. That’s over 9.2 quintillion. Some examples of just how big this number is:

If everyone on the planet each randomly filled out a bracket, the odds would be over 1.5 BILLION to 1 against anyone having a perfect bracket.

If all possible brackets were stacked on top of each other (on standard paper), the pile would reach from the moon and back over 1.1 million times.

All possible brackets (on standard paper) would weigh 100,000 times more than every man, women, and child on earth combined.

Assume on the day the universe was formed (approximately 20 billion years ago) that 6.6 billion people (the world’s current population) would have each started filling out one bracket per second; as of today they would completed less than 10% of all possible brackets.

Even if a person had a 90% chance of winning each game he picked, his odds would still be 763 to 1 against picking a perfect bracket.