Primality proof for n = 669909697361913545660898382546007419518544524592370543:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2788900573532341797131599550190476443808598899.html>2788900573532341797131599550190476443808598899 is prime.</a>
<br>b^((n-1)/2788900573532341797131599550190476443808598899)-1 mod n = 640093040736131505187168390086969230074145600489316288, which is a unit, inverse 519136795617045121268162467342718511295987927661735653.
<p>(2788900573532341797131599550190476443808598899) divides n-1.
<p>(2788900573532341797131599550190476443808598899)^2 > n.
<p>n is prime by Pocklington's theorem.