19611...68099 (329-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

                       196110919 9601661101 9106110911 1091181160 1160916691
6991811190 1199960116 0916101619 9661966616 6896691689 9699110061 1006910091
1069110861 1090911069 1168111909 1600116619 1666116889 1690116981 1806118691
1891118919 1900119069 1908119609 1966119801 1981919961 1999160169 6060160611
6068960869 6089960919 6096161169 6160961681 6186161991 6608966809 6688968099

The smallest prime greater than a googol formed from the concatenation of the first n invertible primes, i.e., {19, 61, 109, ..., 66889, 68099}, (case n=73). [Bajpai]