White Dwarf =Infinity ????

I read that the last two things that happen when the Sun runs out of
fusion fuel,and balloons out to Jupiter(red giant) it then looses these
outer layers to space where they form a glowing "planetary nebula"
that's final step #1 Number 2 is even more intriguing.for now what
is left is a tiny White Dwarf that has this fate. It will fade and
fade,and do this forever. It takes 3 neutron stars to have the mass of
a black hole. How many white dwarfs to equal one neutron star? Tricky
thinking for its something like putting a supernova back together, Bert