Numbers in Words, Prime Factorization & Roman Numerals

Type any number to see it spelled out across nine languages, convert it to Roman numerals, or simplify it automatically into prime factors.

Created by Inder J. Taneja

Digits only, up to 15 digits (zero to 999,999,999,999,999). Pick a preferred language to feature it above the rest.

Select the speaker beside any language to hear its words.

Western languages
Hindi & East Asian
Prime factorization
The factorization updates automatically with the number above.
How it's built

Roman numerals are shown for values from 1 to 3,999,999. For values above 3,999, the part in parentheses is multiplied by 1,000.