Pi has been calculated to over 100 trillion digits — but 39 digits is enough to measure the observable universe to the width of a hydrogen atom

The observable universe is about 93 billion light-years in diameter

The observable universe spans approximately 93 billion light-years across

What is the estimated number of galaxies in the observable universe, and what factors contribute to the uncertainty in this estimation?

Approximately 2 trillion galaxies, with uncertainty due to observational limits and cosmic variance

There are more possible arrangements of a deck of cards than atoms on Earth — 52! ≈ 8 × 10^67

Card arrangements vastly exceed Earth's atoms: 52! ≈ 8 × 10^67

A prime number cannot be divided evenly by any number except 1 and itself — the largest known has 24 million digits

Prime numbers are indivisible by any number other than 1 and themselves, with the largest known having 24 million digits

There are more possible chess games than atoms in the observable universe — about 10^120 vs 10^80

Chess games exceed the observable universe's atom count: 10^120 > 10^80

A googol is 10^100 — Google was named after it (misspelled)

Google's name, derived from a misspelling of "googol," represents 10^100