A Pre-RMO question! -3

Let abc\overline{abc} be a three-digit numbers with non-zero digits such that a2+b2=c2a^2+b^2=c^2. What is the largest possible prime factor of abc\overline{abc}?

Note : aa, bb, and cc are digits of abc\overline{abc} just like 22, 33, and 77 are digits of 237237.

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