Primality proof for n = 3456146551018122488287:

Take b = 2.

b^(n-1) mod n = 1.

6193811023329968617 is prime.
b^((n-1)/6193811023329968617)-1 mod n = 1130139711321981832347, which is a unit, inverse 2645154751524388803712.

(6193811023329968617) divides n-1.

(6193811023329968617)^2 > n.

n is prime by Pocklington's theorem.