- 25 is a square number (52=25)
- 25 is the sum of the first five odd numbers (1+3+5+7+9)
- In most states, you have to be 25 to rent a car
- You have to be at least 25 to get elected to the United States House of Representatives
- A 25 year anniveraru is typically celebrated with a gift of silver (hey, it could be a silver car, haha)
- The year 25 BC was a leap year
- It is the smallest square that is also a sum of two squares: 25 = 3² + 4². Hence it often appears in demonstrations of the Pythagorean theorem
- Heinz Catsup leaving a bottle travels at 25 miles per year
- Wild Turkeys can run up to 25 mph
- Lake Baikai is the oldest freshwater lake on earth. It was formed 25 million year ago
- Cows drink about 25 gallons of water a day
- A swordfishes lifespan is estimated at 25 years
- In Baseball, the number 25 is typically reserved for the best slugger on the team (think Mark McGwire, Barry Bonds, and Mark Teixeira)
- 25 is the atomic number for Manganese
- The usual TCP port for SMTP (I know, I know, my geek is showing)
- When you add the digit 6 to 25 you obtain two squares: 625 = 252, and 256 = 162 (did I mention I am a math geek too?)
- Ready to celebrate? World Pasta day is October 25th (And PTI's official Birthday!)
- The Number 25 can be partitioned 1958 ways!!
- The sun takes 25 days to do a complete rotation on itself
- It is the 13th odd number
- To say "25" in American Sign Languuage: use a palm-forward "5 handshape" and wiggle your middle finger downward a couple times.
- The Spanish word for 25 is Veinticinco (Weh-een-tee-SINK-o)
- The French word for 25 is vingt-cinq (van-sank)
- 25 miles is about the same length as 40 kilometers (1 mile = 1.6 kilometers)
- A 2D shape made up of 25 sides is called an icosikaipentagon ([eye-so-sick-eye-pent-a-gone)
