// LFACTOR Computation

sage: L = 2^249 - 15145038707218910765482344729778085401
sage: (-1 / L) % (2^52)
547593343082025

//The result is the LFACTOR needed on the Montgomery Reduction algorithm to adjust the number to be divisible
by R mod L it also fits on an u64 as 547593343082025 < 2^64