You need to specify which type of differences you are referring to.
661-750 AD
Caliph Ali was assassinated by Kharijites in 661 C.E., resulting in the end of the Rightly-Guided Caliphs.
from 632 to 661 AD Selyan Thomas Grover Middle School
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110.1667
661 is prime.
Raja Dahir (Sanskrit: राजा दाहिर, 661-712 AD) was the last Hindu ruler in Sindh and parts of the Punjab in modern Pakistan.
3√661 ≈ 8.711
661 x 1
661 x 36 = 23796
661 miles is about 1063.78 kilometres.
The river that is completely within the Muslim lands of 661 AD is the Euphrates River. During this period, the Umayyad Caliphate, established after the Rashidun Caliphate, controlled significant territories that included regions around the Euphrates, particularly in present-day Iraq and parts of Syria. This river was vital for agriculture and trade in the Islamic Empire, contributing to its economic and cultural development.