{{رقم|number = 266| cardinal = | ordinal = | ordinal text =| numeral =266| prime = | divisor=1,2,7,14,19,38,133,266| factorization =2×7×19|roman =CCLXVI| greek prefix = | latin prefix = |bin =| oct =| duo =| hex =}}
'''266''' هو [[عدد صحيح]]<ref>{{ماثوورلد|title=Natural Number|id=NaturalNumber}}</ref><ref>{{استشهاد| url = https://www.merriam-webster.com/dictionary/natural%20number| title = natural number| work = Merriam-Webster.com| publisher = [[ميريام وبستر]]| accessdate = 4 October 2014| مسار الأرشيف = https://web.archive.org/web/20191213133201/https://www.merriam-webster.com/dictionary/natural%20number | تاريخ الأرشيف = 13 ديسمبر 2019 }}</ref><ref>{{Harvard citation text|Carothers|2000}} says: "ℕ is the set of natural numbers (positive integers)" (p. 3)</ref><ref name="Mac Lane & Birkhoff 1999 p15">{{Harvard citation text|Mac Lane|Birkhoff|1999}} include zero in the natural numbers: "Intuitively, the set {{تعبير رياضي|ℕ {{=}} {{mset|0, 1, 2, ...}}}} of all "natural numbers" may be described as follows: {{تعبير رياضي|ℕ}} contains an "initial" number 0; ...". They follow that with their version of the Peano Postulates. (p. 15)</ref> طبيعي بين [[265 (عدد)|265]] و[[267 (عدد)|267]]