1643
1643 is the year the barometer was invented.
- Odd
- Composite
Where 1643 fits
Why 1643 is special
Torricelli filled a tube with mercury and produced a vacuum above it, which was thought impossible. Measuring air pressure and demonstrating that a vacuum can exist were the same experiment.
Factors & digit properties
- Divisors (4)
- 1, 31, 53, 1643
- Prime factorisation
- 31 × 53
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 1643
- Binary
- 11001101011
- Octal
- 3153
- Hexadecimal
- 66b
- Roman numeral
- MDCXLIII
- Scientific notation
- 1.643 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Torricelli produced a sustained vacuum in 1643, contradicting the doctrine that nature abhors one. The Royal Society, chartered in 1662, was founded on exactly that preference for demonstration over authority.
View 1662 →Other connections
- developed from1662
why?
Strength 0.50, confidence "high".
Science
Torricelli's 1643 mercury column both measured atmospheric pressure and produced the first sustained laboratory vacuum, contradicting the doctrine that nature abhors one.
DocumentedScienceGeography: ItalyPeriod: 1643
Common questions
Is 1643 a prime number?
No, 1643 is not prime.
What are the factors of 1643?
The factors of 1643 are 1, 31, 53, 1643.
What is 1643 in Roman numerals?
1643 in Roman numerals is MDCXLIII.
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