The translation the Oxyrhynchus Papyri is available, it shows hexakosiai deka hex = 616, there is NO argument in the translation.
Assuming it is an older ms, older is not more reliable or accurate in textual criticism. Copies wear out when in use. Yet an unused corrupt copy can lay there to be discovered later, older, but corrupt. Meanwhile thousands of newer copies are in circulation among the Greeks in the original language, same as the Hebrews preserved the OT in Hebrew - as impossible to corrupt as the english KJV today.
Sooo, the Egyptian copy that does not agree has been corrupted. It is trash.
The OT is selectively copied from the Tanakh. Much of which has been shown to be archeologically, genetically, logically and/or physically impossible.
After the KJV 1611 and everlier Geneva 1560 bibles were published the DSS were discovered confirming the Hebrew OT mss. Everything supports the biblical account of world history. It is you with the bias thus no authority to teach about the Bible as a non-believer. This thread is about 666 not OT archaeology. The NT was preserved in Greek and used from the 1st century by Nazarene Christians long before Nicea.