The Number 1666: Properties and MeaningsPrime Factors of 1666=2x7x7x17.
1666 is a 279-gonal Number.
1666 is the sum of the Roman numerals.
The Year 1666 ADIn the year 1666 AD Martian polar ice caps are noted by Cassini of Italy.
In the year 1666 AD there was a great fire in london.
In the year 1666 AD Thomas Vaughan died.(Esoteric History)