35731...36911 (318-digits)

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

                                   35731539 7211233277 3673894574 7954756961
3659727839 8839291021 1087110912 2312891447 1559162716 9317831873 2099221323
4724372459 2503254925 9326172683 2729281929 5330233067 3089331333 5934493517
3539358336 7337193853 3919394340 5740794259 4327434944 8346634909 4933499951
1352275519 5563565357 4359236011 6037621763 2963736553 6619670967 3368236911

The smallest googol prime formed from concatenation of first n self primes (case n=87). [Gupta]