Calculate the value of 15!
\(\begin{align*} 15! &= 1\times 2\times 3\times 4\times 5\times 6\times 7\times 8\times 9\times 10\times 11\times 12\times 13\times 14\times 15 \\ &= 1.3077*10^{12} \\ &= 1,307,700,000,000 \end{align*}\)