From charlesreid1




Arthur Eddington's estimate of the total number of protons in the observable universe:


N_{Edd} \approx 15,747,724,136,275,002,577,605,653,961,181,555,468,044,717,914,527,116,709,366,231,425,076,185,631,031,296

or,


N_{Edd} \approx 1.57 \times 10^{79}

Link: https://en.wikipedia.org/wiki/Eddington_number