AI overview
I don't have enough context to write an accurate overview of "646." You've indicated only that the context is "year," which doesn't provide information about what "646" refers to—whether it's a historical year, a regulation number, a phone area code, or something else entirely. Could you provide more details about what "646" is?
AI-generated from the Wikipedia summary — may contain errors.
Article
Uthman ibn Affan founds the city of Jeddah
Year 646 (DCXLVI) was a common year starting on Sunday of the Julian calendar. The denomination 646 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.