11916...98681 (42-digits)

This number is a prime.

                              11 9161116818 9116906911 8808811881 8811898681

The smallest invertible prime that is the concatenation of six consecutive strobogrammatic primes: (1191611, 1681891, 1690691, 1880881, 1881881, 1898681). [Bajpai]