65,279
65279 is the Unicode byte order mark.
- Odd
- Composite
Where 65,279 fits
Why 65,279 is special
In UTF-8 it serves no purpose and still gets written, which is why files sometimes begin with three invisible bytes that break shell scripts and CSV parsers.
Factors & digit properties
- Divisors (4)
- 1, 29, 2251, 65279
- Prime factorisation
- 29 × 2251
- Digit sum
- 29
- Digital root
- 2
Representations
- Decimal
- 65279
- Binary
- 1111111011111111
- Octal
- 177377
- Hexadecimal
- feff
- Scientific notation
- 6.528 × 10^4
Other mathematical patterns
- Deficient number
- Semiprime
- Harshad (Niven) number
Related numbers & connections
One marks bytes that could not be decoded and the other is bytes that should not have been written at all.
View 65533 →Numbers Around Us
- appears alongside65533
why?
Strength 0.50, confidence "high".
Technology & computing
U+FEFF signals byte order in UTF-16 and UTF-32. In UTF-8 it is unnecessary but frequently emitted, appearing as stray leading bytes that confuse parsers expecting a specific first character.
DocumentedTechnology & computingGeography: International — Unicode ConsortiumPeriod: 1991–
Common questions
Is 65,279 a prime number?
No, 65,279 is not prime.
What are the factors of 65,279?
The factors of 65,279 are 1, 29, 2251, 65279.
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