I understand that there are roughly $N=10^{79}$ nucleons in the visible Universe. This number comes from adding up the nucleons of $100$ billion stars in $100$ billion galaxies in the visible Universe i.e. $$N=\frac{10^{30}}{10^{-27}}. 10^{11}.10^{11}=10^{79}$$ where mass of sun is $10^{30}$ kg and mass of proton/neutron is $10^{-27}$ kg.
Is there a simple way of deriving $N$ using the fundamentals of Big Bang nuclesynthesis?
