odd, composite, Fibonacci, triangular, palindrome · 55th positive integer
The number 55
55 is an odd composite number. It is the 55th positive integer.
Quick reference
| Prime factorization | 5 × 11 |
| Divisors | 1, 5, 11, 55 |
| Binary | 110111 |
| Hexadecimal | 0x37 |
| Roman numeral | LV |
| Digit sum | 10 |
| Properties | odd, composite, Fibonacci, triangular, palindrome |
Reading 55 in NumGrid context
The 55 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 55 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 55’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Frequently asked
Is 55 a prime number?
No. 55 is composite. Its prime factorization is 5 × 11.
What are the factors of 55?
The factors (divisors) of 55 are 1, 5, 11, 55.
What is 55 in binary?
55 in binary is 110111. In hexadecimal it's 37.
What is 55 as a Roman numeral?
55 in Roman numerals is LV.
What's the digit sum of 55?
Adding the digits of 55: 5 + 5 = 10.