This number is a composite.
(64*10^10906+53)/9 is the only known (probable) prime in the sequence 77, 717, 7117, 71117, 711117, 7111117 and so on.
(64*10^10906+53)/9 is the only known (probable) prime in the sequence 77, 717, 7117, 71117, 711117, 7111117 and so on.