Let $Q$ be the polynomial $\large Q(x) = a_0 + a_{1}x + a_2x^2... + a_{n}x^{n}$ where $a_0, a_1, a_2 ..., a_n$ are nonnegative integers. If $Q(1) = 6$ and $Q(5) = 154$, and $Q(6) = k$, find the digital sum of the square root of $k$.

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