170
170 is the highest possible finish in darts.
- Even
- Composite
Why 170 is special
It is three darts: treble twenty, treble twenty, bullseye. Anything above 170 cannot be finished in three darts because the double required to win must land exactly, which is why 170 rather than 180 is the number commentators call the big fish.
Factors & digit properties
- Divisors (8)
- 1, 2, 5, 10, 17, 34, 85, 170
- Prime factorisation
- 2 × 5 × 17
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 170
- Binary
- 10101010
- Octal
- 252
- Hexadecimal
- aa
- Roman numeral
- CLXX
- Scientific notation
- 1.700 × 10^2
Other mathematical patterns
- Deficient number
Sport
180 is the highest score from three darts, but a leg must end on a double, so the highest possible checkout is 170 — treble twenty, treble twenty, bullseye. The distinction between scoring and finishing is what makes darts scoring counterintuitive to newcomers.
DocumentedSport
Common questions
Is 170 a prime number?
No, 170 is not prime.
What are the factors of 170?
The factors of 170 are 1, 2, 5, 10, 17, 34, 85, 170.
What is 170 in Roman numerals?
170 in Roman numerals is CLXX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026