1660
1660 is the year the Royal Society was founded and the English monarchy restored.
- Even
- Composite
Where 1660 fits
Why 1660 is special
The Society's motto, roughly 'take nobody's word for it', set out the principle that claims must be demonstrated rather than asserted. It is the oldest continuously existing scientific academy.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660
- Prime factorisation
- 2^2 × 5 × 83
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 1660
- Binary
- 11001111100
- Octal
- 3174
- Hexadecimal
- 67c
- Roman numeral
- MDCLX
- Scientific notation
- 1.660 × 10^3
Other mathematical patterns
- Abundant number
Related numbers & connections
Cromwell died in 1658 and the monarchy returned in 1660. A republic founded on removing a hereditary ruler could not manage a hereditary succession.
View 1658 →Science
The Royal Society's founding motto made verification rather than authority the test of a claim. It is a plain statement of what separates the scientific method from what preceded it, and it dates from the same year England restored its monarchy.
DocumentedScienceGeography: EnglandPeriod: 1660
Common questions
Is 1660 a prime number?
No, 1660 is not prime.
What are the factors of 1660?
The factors of 1660 are 1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660.
What is 1660 in Roman numerals?
1660 in Roman numerals is MDCLX.
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