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The Eddington number is \(N_\text{Edd} = 136 \cdot 2^{256} \approx 1.575 \times 10^{79}\), which Arthur Eddington asserted to be the exact number of protons in the observable universe.[1] 136 is the reciprocal of the fine structure constant, or at least the best available estimation at the time. It is now known to be about \(1/137.035999074\); Eddington's original value, if not his whole argument, is incorrect.

Its full decimal expansion is

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

Sources Edit

  1. [1]

See also Edit

Large numbers in science

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