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Omni-MATH / Given any positive integer, we can write the integer in base 12 and add together…

Problem

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problem

Given any positive integer, we can write the integer in base 12 and add together the digits of its base 12 representation. We perform this operation on the number 7653217^{6^{5^{3^{2^{1}}}}} repeatedly until a single base 12 digit remains. Find this digit.
Plain-text mathematical notation (without MathML)
Given any positive integer, we can write the integer in base 12 and add together the digits of its base 12 representation. We perform this operation on the number 7^(6^(5^(3^(2¹)))) repeatedly until a single base 12 digit remains. Find this digit.
Original LaTeX notation
Given any positive integer, we can write the integer in base 12 and add together the digits of its base 12 representation. We perform this operation on the number $7^{6^{5^{3^{2^{1}}}}}$ repeatedly until a single base 12 digit remains. Find this digit.

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