What is 6 to the power of -4
6-4 = 1/64
$${{\mathtt{6}}}^{-{\mathtt{4}}} = {\frac{{\mathtt{1}}}{{\mathtt{1\,296}}}} = {\mathtt{0.000\: \!771\: \!604\: \!938\: \!271\: \!6}}$$
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0.0007716049382716049382716049382716049382716049382716049382..................