61
- It is the 18th prime number.
- The chemical element with the atomic number 61 (promethium)
- The code for international direct dial phone calls to Australia
- 61*, a 2001 baseball movie directed by Billy Crystal
- Sixty-one is a number often related to the Colonel's insane speech in Metal Gear Solid 2: Sons of Liberty
- Highway 61 Revisited is a Bob Dylan album
- The P-61 is the Northrop designed fighter first designated as the XP-61. It first flew on May 26, 1942. It is also known as the Black Widow as it was the first fighter aircraft designed to be a night fighter
- Sixty 1 brand tobacco produced by Nationwide Tobacco
- At age 61, President Harry Truman decided to drop atom bomb in 1945
- At age 61, President Richard Nixon, resigned the presidency in 1974.
- In 61B.C. Gaius Julius Caesar took command in Spain
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