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Heptakulus is equal to \(7 \& 7 \& 7 \& 7 \& 7 \& 7 \& 7 = \{7,7/2\}\) using the array of operator and BEAF.[1] The term was coined by Cookie Fonster. The number is derived from triakulus and the Greek word "hepta" for seven. It is possibly the largest named googolism which is a perfect power, but neither a square nor a cube.

## Approximations in other notations

Since this number hasn't been formalized, these are expectations.

Notation Approximation
Bird's array notation \(\{7,7 [1 [1 [1 [1 [1 [2 \backslash_{5} 6 \backslash_{6} 2] 2] 2] 2] 2] 2] 2\}\)

## Sources

1. Pointless Gigantic List of Numbers - Part 6: The Mighty RoyalsPointless Large Number Stuff. Retrieved 2017-06-01.