Neutron lifetime is approx. 880s, or 1.6 * 10^46 planks times. Also, in a "naive" model quarks fly back and forth at almost light speed, bouncing back and forth, and only a single bounce per 3.3*10^26 times is fatal to the existence of a neutron. Even this model is wrong, it shows to what extent neutron is "almost" stable. Are these numbers surprising to the same extent as other "unnatural" numbers in physics?