Missing digits in 19!

19!=12164510a4a8832000\large 19! = \overline{12164510{\color{blue}a}4{\color{blue}a}8832000}

Determine the digit a{\color{blue}a}.

Note: 19!=19×18×17××2×1 19 ! = 19 \times 18 \times 17 \times \cdots \times 2 \times 1

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