GMP-ECM 7.0.4-dev [configured with GMP 6.1.1, --enable-asm-redc] [ECM]
Input number is Phi(18872,10) (8065 digits)
Using B1=100000, B2=35857930, polynomial x^2, sigma=1:4160214580
Step 1 took 223003ms
Step 2 took 43243ms
********** Factor found in step 2: 24614388746608680653249729
Found prime factor of 26 digits: 24614388746608680653249729
Composite cofactor (Phi(18872,10))/24614388746608680653249729 has 8039 digits