650 is a pronic number. It is the product of two consecutive integers: 25 x 26 = 650.
650 is the sum of the first 12 squares. Hence, it is a pyramidal number.
650 is 22022 in base 4 and 1616 in base 7.
In the 1950s, advanced features of the IBM 650 Magnetic Drum Data Processing Machine brought increased reliability to the young field of electronic computing.
Source: Number Gossip
