16661...80191 (40-digits)

This number is a prime.

                                 1666116901 1666880101 1668188611 1669080191

Just showing those entries submitted by 'Bajpai': (Click here to show all)

The smallest invertible prime formed from the concatenation of four consecutive bemirps, i.e., {1666116901, 1666880101, 1668188611, 1669080191}. [Bajpai]