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Not to be confused with tethrafact.

Tetrafact is the mixed factorial of 4, written as 4*, and equal to $$((1+2) \times 3)^{4} = 6,561$$.[1] The term was coined by SpongeTechX.

It is also an output of the Exploding Tree Function: $$E(3) = 6,561$$. It is also the number of ways to add 11 ordinals.

## Etymology Edit

The name of this number is based on the Greek prefix "tetra-" and the word "factorial".

## Sources Edit

1. SpongeTechX's Googology World