even, composite, triangular, palindrome · 66th positive integer
The number 66
66 is an even composite number. It is the 66th positive integer.
Quick reference
| Prime factorization | 2 × 3 × 11 |
| Divisors | 1, 2, 3, 6, 11, 22, 33, 66 |
| Binary | 1000010 |
| Hexadecimal | 0x42 |
| Roman numeral | LXVI |
| Digit sum | 12 |
| Properties | even, composite, triangular, palindrome |
Reading 66 in NumGrid context
The 66 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 66 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.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 66 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 66 a prime number?
No. 66 is composite. Its prime factorization is 2 × 3 × 11.
What are the factors of 66?
The factors (divisors) of 66 are 1, 2, 3, 6, 11, 22, 33, 66.
What is 66 in binary?
66 in binary is 1000010. In hexadecimal it's 42.
What is 66 as a Roman numeral?
66 in Roman numerals is LXVI.
What's the digit sum of 66?
Adding the digits of 66: 6 + 6 = 12.