This is a Euler Irregular (PR)prime.

In Pari/GP, one can compute this PRP for verification like this:
allocatemem(2*10^10)
E(n)=x=1/4;abs(eval(bernpol(n+1)))*4^(n+1)/(n+1)
PRP=E(69468)/13247122135;

sPRP in multiple bases

To be completed...