By the Numbers: Seeding, and its impact on your bracket

While filling out a full NCAA Tournament bracket can be a daunting task, past editions can provide some insight into what to expect from each of the 16 seeds.

Here are 20 numbers worth knowing before filling out your tournament bracket.

0

Number of wins by a No. 16 seed over a No. 1 seed (0-120).

1

The number of times all four No. 1 seeds have made the Final Four (in 2008).

2

Tournaments in which a No. 13, No. 14, and No. 15 seed each won a game in the round of 64 (1991, 2013).

3

The number of times in which a 12-seed has failed to win a game in the last 32 NCAA tournaments.

4

Titles won by No. 2 seeds in the 30 years since the field expanded to 64 teams, the last coming in 2004.

5-55

The all-time record of No. 9 seeds in the round of 32.

6 of 8

No. 1 seeds have won six of the past eight national championships, and 11 of the last 16. The others went to a No. 2 seed, three No. 3 seeds, and a No. 7 seed. No. 1 seeds have won 17 of 30 national titles since the field expanded to 64 teams.

6

Consecutive years in which a No. 4 seed had fallen to a No. 13 seed in the opening round, prior to last season, the longest streak in the history of the 4-13 matchup.

7

Men's teams to win the tournament with a perfect record (the last came in 1976).

8

All-time wins by No. 15 seeds (four of those eight have come in the past three years).

9

Thirteen of the past 17 national champions were ranked in the top nine of the AP preseason poll.

10

The exact number of upsets, based on seed, in four of the past six NCAA tournaments.

11

The lowest seed to make the Final Four, most recently in 2011.

13

Double-digit seeds to make the Sweet Sixteen in the past five years.

20

All-time trips to the Sweet 16 by No. 12 seeds, which is as often as 7-seeds, more often than 11-seeds (17), and more often than 8- and 9-seeds combined (16).

23

Seasons in which at least one No. 12 seed has advanced to the round of 32 in the past 26 years.

29-3

The record of No. 3 seeds in round of 64 games in the past eight tournaments.

30

Combined wins in the round of 64 and beyond by 12- and 13-seeds in the last seven seasons, an average of 4.3 per year.

2007

The last year each of the top four seeds in each region survived the round of 64 - only the fourth time since 1985 that's happened.

9.2-quintillion to 1

Odds of picking a perfect bracket.