660
Aluminium melts at about 660 degrees Celsius.
- Even
- Composite
Where 660 fits
Why 660 is special
Aluminium is the most abundant metal in the Earth's crust and was more valuable than gold in the 1850s, because separating it from its ore requires electricity rather than heat. Napoleon III reputedly reserved aluminium cutlery for his most honoured guests.
Factors & digit properties
- Divisors (24)
- 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660
- Prime factorisation
- 2^2 × 3 × 5 × 11
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 660
- Binary
- 1010010100
- Octal
- 1224
- Hexadecimal
- 294
- Roman numeral
- DCLX
- Scientific notation
- 6.600 × 10^2
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
Aluminium melts at about 660 degrees and iron at 1,538, yet aluminium was a precious metal into the 1880s. Its ore resists heat alone and needs electricity, so melting point and availability came apart completely.
View 1538 →Other connections
- contrasts with1538
why?
Strength 0.50, confidence "high".
Science
Aluminium is the commonest metal in the crust and was a precious material until electrolytic extraction arrived in 1886. Its ore cannot be reduced by heat alone, which is why abundance and availability diverged so sharply.
DocumentedScience
Common questions
Is 660 a prime number?
No, 660 is not prime.
What are the factors of 660?
The factors of 660 are 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660.
What is 660 in Roman numerals?
660 in Roman numerals is DCLX.
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