80530...22123 (109-digits)

This number has not yet been tested at this site.

                                  805309734 5132743362 8318584070 7964601769
9115044247 7876106194 6902654867 2566371681 4159292035 3982300884 9557522123

The largest prime number that lies within the fraction 355/113 which is the approximation of π discovered by the Chinese mathematician/astronomer Zu Chongzhi. [Pace]