55555555
This number is a composite.
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The product of this repdigit number consisting of eight 5’s with all its truncations plus 2 is the largest non-titanic prime with this property, i.e., 55555555*5555555*555555*55555*5555*555*55*5+2 =
8076345598969038563182858894921877. [Loungrides]
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