3166
ISO 3166 defines the two-letter country codes used almost everywhere.
- Even
- Composite
Where 3166 fits
Why 3166 is special
GB, DE, JP and the rest come from this standard, and so do most country-code internet domains — though not all, since .uk was assigned before the standard settled on GB. Codes are also formally retired, which is how .su and .yu became historical curiosities.
Factors & digit properties
- Divisors (4)
- 1, 2, 1583, 3166
- Prime factorisation
- 2 × 1583
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 3166
- Binary
- 110001011110
- Octal
- 6136
- Hexadecimal
- c5e
- Roman numeral
- MMMCLXVI
- Scientific notation
- 3.166 × 10^3
Other mathematical patterns
- Deficient number
- Happy number
- Semiprime
Related numbers & connections
ISO 4217 currency codes are usually built from ISO 3166 country codes plus the currency's initial — USD is US plus dollar.
View 4217 →The animal transponder code embeds a three-digit country code drawn from the same numbering used for national identification.
View 11784 →Numbers Around Us
- appears alongside4217
why?
Strength 0.50, confidence "high".
- appears inStandards issued by an organisation
why?
Strength 0.50, confidence "high".
- appears inNumbers assigned as identifiers
why?
Strength 0.50, confidence "high".
Other connections
Geography
ISO 3166 defines the two-letter country codes behind GB, DE, JP and most country internet domains. Not all: .uk predates the standard settling on GB. Codes are also retired, which is how .su and .yu became relics of states that no longer exist.
DocumentedGeography
Common questions
Is 3166 a prime number?
No, 3166 is not prime.
What are the factors of 3166?
The factors of 3166 are 1, 2, 1583, 3166.
What is 3166 in Roman numerals?
3166 in Roman numerals is MMMCLXVI.
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