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The multillion is equal to $$10^{3\cdot 10^{3\cdot 10^{3\cdot\text{tredecillion}}} + 3}$$ [1], or $$10^{3 \cdot 10^{3 \cdot 10^{3 \cdot 10^{42}}} + 3}$$. The term was coined by Jonathan Bowers. Currently, it is the largest number with a name ending in -illion that he has coined.

Written out in decimal form multillion is: $$10^{3\cdot 10^{3\cdot 10^{3,000,000,000,000,000,000,000,000,000,000,000,000,000,000}} + 3}$$

## Etymology

The name of this number is based on the word "multiverse" and the suffix "-illion".

## Expressions in other notations

Notation Expression
Up-arrow notation $$10 \uparrow (3 \times (10 \uparrow (3 \times (10 \uparrow (3\text{ tredecillion}))))+3)$$
Chained arrow notation $$10 \rightarrow (3 \times (10 \rightarrow (3 \times (10 \uparrow (3\text{ tredecillion}))))+3)$$
BEAF $$\{10,\{3\times \{10,3 \times \{10,3\text{ tredecillion}\}\}+3\}\}$$
Munafo's ASCII-lexicographic ordering p3_e042_3

## Sources

1. Illion Numbers by Jonathan Bowers