First, we can write \begin{align*} &\frac{1}{(i + j + 1)(i + j + 2) \dotsm (i + j + 6)(i + j + 7)} \\ &= \frac{1}{6} \cdot \frac{(i + j + 7) - (i + j + 1)}{(i + j + 1)(i + j + 2) \dotsm (i + j + 6)(i + j + 7)} \\ &= \frac{1}{6} \left( \frac{1}{(i + j + 1)(i + j + 2) \dotsm (i + j + 6)} - \frac{1}{(i + j + 2) \dotsm (i + j + 6)(i + j + 7)} \right).\end{align*}Thus, the following sum telescopes: \begin{align*} &\sum_{j = 0}^\infty \frac{1}{(i + j + 1)(i + j + 2) \dotsm (i + j + 6)(i + j + 7)} \\ &= \sum_{j = 0}^\infty \frac{1}{6} \left( \frac{1}{(i + j + 1)(i + j + 2) \dotsm (i + j + 6)} - \frac{1}{(i + j + 2) \dotsm (i + j + 6)(i + j + 7)} \right) \\ &= \frac{1}{6} \left( \frac{1}{(i + 1) \dotsm (i + 6)} - \frac{1}{(i + 2) \dotsm (i + 7)} \right) \\ &\quad + \frac{1}{6} \left( \frac{1}{(i + 2) \dotsm (i + 7)} - \frac{1}{(i + 3) \dotsm (i + 8)} \right) \\ &\quad + \frac{1}{6} \left( \frac{1}{(i + 3) \dotsm (i + 8)} - \frac{1}{(i + 4) \dotsm (i + 9)} \right) +\dotsb \\ &= \frac{1}{6 (i + 1)(i + 2) \dotsm (i + 5)(i + 6)}.\end{align*}We can then write \begin{align*} &\frac{1}{6 (i + 1)(i + 2) \dotsm (i + 5)(i + 6)} \\ &= \frac{1}{5} \cdot \frac{(i + 6) - (i + 1)}{6 (i + 1)(i + 2) \dotsm (i + 5)(i + 6)} \\ &= \frac{1}{30} \left( \frac{1}{(i + 1)(i + 2)(i + 3)(i + 4)(i + 5)} - \frac{1}{(i + 2)(i + 3)(i + 4)(i + 5)(i + 6)} \right).\end{align*}We obtain another telescoping sum: \begin{align*} &\sum_{i = 0}^\infty \frac{1}{6 (i + 1)(i + 2) \dotsm (i + 5)(i + 6)} \\ &= \sum_{i = 0}^\infty \frac{1}{30} \left( \frac{1}{(i + 1)(i + 2)(i + 3)(i + 4)(i + 5)} - \frac{1}{(i + 2)(i + 3)(i + 4)(i + 5)(i + 6)} \right) \\ &= \frac{1}{30} \left( \frac{1}{(1)(2)(3)(4)(5)} - \frac{1}{(2)(3)(4)(5)(6)} \right) \\ &\quad + \frac{1}{30} \left( \frac{1}{(2)(3)(4)(5)(6)} - \frac{1}{(3)(4)(5)(6)(7)} \right) \\ &\quad + \frac{1}{30} \left( \frac{1}{(3)(4)(5)(6)(7)} - \frac{1}{(4)(5)(6)(7)(8)} \right) + \dotsb \\ &= \frac{1}{30} \cdot \frac{1}{(1)(2)(3)(4)(5)} = \boxed{\frac{1}{3600}}.\end{align*}