663

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Number

$663$ (six hundred and sixty-three) is:

$2 \times 13 \times 17$

The $33$rd Smith number after $4$, $22$, $27$, $58$, $\ldots$, $576$, $588$, $627$, $634$, $636$, $645$, $648$, $654$:

$6 + 6 + 3 = 2 + 1 + 3 + 1 + 7 = 15$

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