Number
164 in Roman numerals
164 is written CLXIV
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How CLXIV is built
Roman numerals are written one decimal place at a time, largest first.
- Chundreds · 1C is 100.
- LXtens · 6L (50) plus X (10) makes 60.
- IVones · 4I before V means 5 − 1 = 4. This saves writing IIII.
100 + 60 + 4 = 164
The pair IV uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not CLXIIII (7 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CLXIV (5 letters) is the standard.
About the number 164
- 164 is even and can be split into prime factors: 2 × 2 × 41, or in Roman numerals II × II × XLI.
- CLXIV has 5 letters. 604 of the numbers up to 1,000 have longer numerals.
Counting from 161 to 170
Every number from 161 to 170 starts CLX (160); only the ending changes.
| Number | Roman numeral |
|---|---|
| 161 | CLXI |
| 162 | CLXII |
| 163 | CLXIII |
| 164 | CLXIV |
| 165 | CLXV |
| 166 | CLXVI |
| 167 | CLXVII |
| 168 | CLXVIII |
| 169 | CLXIX |
| 170 | CLXX |