In base 10, it is easy to test for divisibility by 25, by seeing if the last two digits of the number are 25, 50, 75 or 00.

**Twenty-five** is also

- The atomic number of manganese.
- In years of marriage, silver wedding anniversary.
- The minimum age to be elected to the House of Representatives. "Under 25" is a common cut-off for designating youth.
- The number of cents in a quarter, an American coin with George Washington's portrait, and a Canadian coin.
- The designation of United States Interstate 25, a freeway that runs from New Mexico to Wyoming.
- The number of Florida electoral votes for the 2000 U.S. presidential election.

This article is about the number. For the year AD 25, see 25.