1166

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Number

$1166$ (one thousand, one hundred and sixty-six) is:

$2 \times 11 \times 53$

The $11$th heptagonal pyramidal number after $1$, $8$, $26$, $60$, $115$, $196$, $308$, $456$, $645$, $880$:

$1166 = 1 + 7 + 18 + 34 + 55 + 81 + 112 + 148 + 189 + 235 + 286 = \dfrac {11 \paren {11 + 1} \paren {5 \times 11 - 2} } 6$

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