GMP-ECM 7.0.4-dev [configured with GMP 6.1.1, --enable-asm-redc] [ECM]
Input number is Phi(16676,10) (7561 digits)
Using B1=250000-250000, B2=183032866, polynomial Dickson(3), sigma=1:3900629765
Step 1 took 0ms
Step 2 took 110621ms
********** Factor found in step 2: 157554119215176342291178104768749
Found prime factor of 33 digits: 157554119215176342291178104768749
Composite cofactor (Phi(16676,10))/157554119215176342291178104768749 has 7528 digits