16716...71311 (84-digits)

This number is a prime.

                                                             1671 6315715114
9139137131 1271131091 0710310197 8983797371 6761595347 4341373129 2319171311

The largest prime less than a googol formed from the reverse concatenation of first n multi-digit primes, (case n=35). [Bajpai]