Abstract: We consider the quench of the one-dimensional Bose gas from zero to infinite interaction, in which the relation between modes is nonlinear, and consequently Wick's theorem does not hold. We provide exact analytical results for the time evolution of the dynamical density-density correlation function. We prove that its stationary value is described by a Generalized Gibbs Ensemble (GGE). Finally, we analyze the entanglement properties of the the asymptotic steady state after the quench; we provide exact analytical results both for the leading extensive parts and the subleading terms for the entropies as well as for the cumulants of the particle number fluctuations.