668
ISO 668 fixes the dimensions of freight containers.
- Even
- Composite
Where 668 fits
Why 668 is special
Standardising the box, rather than the ship or the crane, is what made global container shipping possible, and the twenty-foot unit is still the industry's counting measure.
668 is part of
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 167, 334, 668
- Prime factorisation
- 2^2 × 167
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 668
- Binary
- 1010011100
- Octal
- 1234
- Hexadecimal
- 29c
- Roman numeral
- DCLXVIII
- Scientific notation
- 6.680 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
Standardising the container rather than the ship is what made global container shipping possible.
One standard fixes the box's dimensions and the other how it is marked, and container shipping needed both.
View 6346 →Technology & computing
ISO 668 classifies freight containers by external dimensions and ratings. The twenty-foot equivalent unit derived from it remains the standard measure of container throughput.
DocumentedTechnology & computingGeography: International — ISO member bodiesPeriod: 1968–CWE-668 is exposure of a resource to the wrong control sphere, the parent class covering permissions, path traversal and information disclosure weaknesses alike.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
Common questions
Is 668 a prime number?
No, 668 is not prime.
What are the factors of 668?
The factors of 668 are 1, 2, 4, 167, 334, 668.
What is 668 in Roman numerals?
668 in Roman numerals is DCLXVIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026