Peyton Manning
Peyton Manning set the career touchdown record Sunday. Chris Humphreys-USA TODAY Sports (Reuters)

Denver Broncos quarterback Peyton Manning broke the NFL all-time touchdown record on Sunday, throwing four touchdowns in the team's win against the San Francisco 49ers to surpass Brett Favre's 508 total. With Manning atop the record books, is the all-time TD record unbreakable? Maybe. Aaron Rodgers, Matthew Stafford and Andrew Luck will need big seasons to come close, but it won't be an easy task.

Here's a look at other achievements in the NBA, MLB and NHL that may be harder to break than Manning's touchdown record.

MLB Unbreakable Records

Hitting Streak

Baseball has plenty of records that seem unbreakable. Joe DiMaggio's 56-game hitting streak, set in 1941, was most recently challenged by Dan Uggla, who hit in 31 straight games. The closest player in the last decade was Jimmy Rollins, who hit in 38 straight games during the 2005 and 2006 seasons.

Wins

Cy Young's 511 career wins will likely stick around for a very long time as fewer and fewer pitchers are even reaching 300. Tim Hudson, 39, leads active players with 214, followed by C.C. Sabathia, 34, with 208. St. Louis Cardinals pitcher John Lackey, 35, and Detroit Tigers starter Justin Verlander, 31, have 152 wins; Mariners pitcher Felix Hernandez, 28, has 125 career wins; and Los Angeles Dodgers ace Clayton Kershaw, 26, has 98 wins. The last pitcher to enter the 300-win club was Randy Johnson in 2009.

Stolen Bases

Rickey Henderson's 1,406 career stolen bases seems almost impossible to topple as there are only eight players to reach 600 stolen bases, five to reach 700 stolen bases; two have 800 career stolen bases and only two have cracked 900 stolen bases. Juan Pierre, 37, is the active career leader with 614, followed by Ichiro Suzuki, 40 (487), Carl Crawford, 31, (470), Jose Reyes, 31, (453) and Jimmy Rollins, 35, (453).

NBA Unbreakable Records

Minutes Per Game

Wilt Chamberlain played 3,882 minutes in the 1961-62 NBA season, which averages out to 48.5 minutes per game -- ridiculous considering a regulation game is only 48 minutes. No one has come close to that number in over 50 years. Within the past decade, only LeBron James managed to crack the top 100, when he played 3,388 minutes in the 2004-05 season to average 42.4 minutes per game and again in the 2005-06 season where he averaged 42.5 mpg.

Assists

John Stockton's career assist record of 15,806 is also unlikely to fall, with Steve Nash (10,335) the closest active player. Los Angeles Clippers point guard Chris Paul has 6,112, Kobe Bryant has 5,925, and James has 5,790.

Points Per Game

The single-season points per game record of 50.36, held by Chamberlain, will not be beat, but the career PPG record could be. Michael Jordan averaged 30.12 ppg for his career, and there are several active players in the top 10, including James in third place with 27.52 ppg and Kevin Durant with 27.40 ppg.

NHL Unbreakable Records

Career Points

Wayne Gretzky is "The Great One" for a reason, and his career record of 2,857 points is nearly 1,000 more than the No. 2 all-time points leader, Mark Messier (1,887). Jaromir Jagr's, 42, resurgence has him in 6th place with 1,758, and considering he wants to play until he is 50, he could challenge Gordie Howe for third place (1,850) or even Messier.

Point-Scoring Streak

Consistency records are the hardest to break, and Gretzky's scoring in 51 straight games seems to be untouchable. Sidney Crosby had a 25-game streak, and only one player, Mario Lemieux, scored in 40 or more straight games.