1766
1766 is the year hydrogen was identified as a distinct substance.
- Even
- Composite
Where 1766 fits
Why 1766 is special
Cavendish called it inflammable air and showed burning it produced water, which meant water was not an element. That result dismantled a two-thousand-year-old framework.
1766 is part of
Factors & digit properties
- Divisors (4)
- 1, 2, 883, 1766
- Prime factorisation
- 2 × 883
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 1766
- Scientific notation
- 1.766 × 10^3
Roman numerals
M D C C L X V I
Binary
1 1 0 1 1 1 0 0 1 1 0
1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 1,766
Octal
3 3 4 6
3 × 512 + 3 × 64 + 4 × 8 + 6 × 1 = 1,766
Hexadecimal
6 e 6
6 × 256 + e × 16 + 6 × 1 = 1,766
Read as powers of two: 1,024 + 512 + 128 + 64 + 32 + 4 + 2 = 1,766.
In historical numeral systems
Egyptian
1 lotus, 7 coils of rope, 6 hobbles, 6 strokes
1 × 1,000 + 7 × 100 + 6 × 10 + 6 × 1 = 1,766. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 9 vertical wedges (sixties place), 2 corner wedges + 6 vertical wedges (units place)
29 × 60 + 26 = 1766. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
1766 is a year in the 18th century, in the 1760s.
Cavendish showed in 1766 that burning inflammable air produced water, and oxygen was isolated in 1774. Between them, water and air stopped being elements.
View 1774 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- developed from1774
why?
Strength 0.50, confidence "high".
Science
In 1766, Henry Cavendish identified hydrogen as a distinct substance (England).
DocumentedScienceGeography: EnglandPeriod: 1766Cavendish showed in 1766 that burning inflammable air produced water. Water had been one of the classical elements since antiquity, and the experiment showed it was a compound.
DocumentedScienceGeography: EnglandPeriod: 1766
Common questions
Is 1766 a prime number?
No, 1766 is not prime.
What are the factors of 1766?
The factors of 1766 are 1, 2, 883, 1766.
What is 1766 in Roman numerals?
1766 in Roman numerals is MDCCLXVI.
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: 15 July 2026