The Number 1650: Properties and MeaningsPrime Factors of 1650=2x3x5x5x11.
1650 is the number of connected partial orders on 7 unlabeled elements.
The Year 1650 ADIn the year 1650 AD there was a Uranus-Neptune conjunction in Sagittarius.
In the year 1650 AD Otto von Guericke invented an air pump.
In the year 1650 AD Descartes died.