667
D. 667 is the Trout Quintet.
- Odd
- Composite
Where 667 fits
Why 667 is special
Its unusual scoring includes a double bass instead of a second violin, which was specified by the amateur cellist who commissioned it.
Factors & digit properties
- Divisors (4)
- 1, 23, 29, 667
- Prime factorisation
- 23 × 29
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 667
- Binary
- 1010011011
- Octal
- 1233
- Hexadecimal
- 29b
- Roman numeral
- DCLXVII
- Scientific notation
- 6.670 × 10^2
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Both take their names from Schubert songs whose melodies they vary.
View 810 →Media & popular culture
D. 667 is scored for piano, violin, viola, cello and double bass, an arrangement requested by the commissioner Sylvester Paumgartner. The fourth movement varies Schubert's song Die Forelle.
DocumentedMedia & popular cultureGeography: AustriaPeriod: 1819
Common questions
Is 667 a prime number?
No, 667 is not prime.
What are the factors of 667?
The factors of 667 are 1, 23, 29, 667.
What is 667 in Roman numerals?
667 in Roman numerals is DCLXVII.
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