n=39415521447428240577340090894326276694302354185397046540029086656729227446572237213583653011691
MPQS: starting Gauss over F_2 on 45271 relations
MPQS: allocating 127664222 words for Gauss
  ***   at top-level: factorint(n,2)
  ***                 ^--------------
  *** factorint: the PARI stack overflows !
  current stack size: 4000000 (3.815 Mbytes)
  [hint] you can increase GP stack with allocatemem()
after 3996 minutes

time = 72h, 3min, 12,935 ms.
%2 = 
[14440795158818080226166330546007 1]

[2729456447095967194924230710887996479979115418128423888356444813 1]