Can we factor an integer $$N$$ unconditionally, in deterministic polynomial time, given the value of its Euler totient $$\varphi (N)$$ ? We show that this can be done under certain size conditions on prime factors . The key technique is lattice basis reduction using LLL algorithm. Among our results, if has a $$p > \sqrt{N}$$ , then recover $$p$$ time also shed some light analogous factorization...