667

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Number

$667$ (six hundred and sixty-seven) is:

$23 \times 29$

The $7$th tri-automorphic number after $2$, $5$, $7$, $67$, $75$, $92$:

$667^2 \times 3 = 1 \, 334 \, \mathbf {667}$

Also see

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