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25 (twenty-five) is a positive integer following 24 and preceding 26. Its ordinal form is written "25th" or "twenty-fifth".

## Properties

• 25 is an odd number.
• 25 is the 5th square number[1].
• 25 is the result of the Pythagorean triple 32+42 or 9+16=25.
• Its prime factorization is 25 = 5².
• 25 is the first Friedman number.

## Counting to 25 using fingers

It is possible to extend standard counting system so that it can count up to 25. The matter is that when we bend the first five fingers on one hand, we bend one on another hand and unbend all on the first. Extension of this method can be used to count all the way to 1,023, using powers of 2.

## In googology

• In Greek-based number-naming systems, 25 is associated with the prefix "pentaicosa-", and with the prefix "quinviginti-" in Latin systems.

• It can be named garfive with the gar- prefix.

## As a cash denomination

Some currencies, such as the Aruban florin and the Netherlands Antillean guilder, have banknotes with this number in the denomination.

Some currencies, such as the Costa Rican colón and the Uzbekistani soʻm, have coins with this number in the denomination.

## Sources

Gar-: garone · gartwo · garthree · garfour · garfive · garsix · garseven · gareight · garnine · garten · garhundred · gargoogol · gartrialogue · gargoogolplex · gargiggol
Fz-: fzone · fztwo · fzthree · fzfour · fzfive · fzsix · fzseven · fzeight · fznine · fzten · fztwenty · fzhundred · fzthousand · fzmillion · fzgoogol · fzmilliplexion · fzgoogolplex · fzgargoogolplex · fzgargantugoogolplex · fzgiggol
Fuga-: fugaone · fugatwo · fugathree · fugafour · fugafive · fugasix · fugaseven · fugaeight · fuganine · fugaten · fugaeleven · fugahundred · fugagoogol · fugagoogolplex · fugagargoogolplex · fugagargantugoogolplex · fugagiggol
Megafuga-: megafugaone · megafugatwo · megafugathree · megafugafour · megafugafive · megafugasix · megafugaseven · megafugaeight · megafuganine · megafugaten · megafugaeleven · megafugatwelve · megafugathirteen · megafugafourteen · megafugafifteen · megafugasixteen · megafugaseventeen · megafugaeighteen · megafuganineteen · megafugatwenty · megafugathirty · megafugaforty · megafugafifty · megafugasixty · megafugaseventy · megafugaeighty · megafuganinety · megafugahundred · megafugagoogol · megafugagoogolplex · megafugagargoogolplex · megafugagargantugoogolplex
Booga-: boogaone · boogatwo · boogathree · boogafour · boogafive · boogasix · boogaten boogahundred · boogagoogol · boogagoogolplex
Gag: gagone · gagtwo · gagthree · gagfour · gagfive · gagsix · gagseven · gageight · gagnine · gagten · gaggoogol · gaggoogolplex