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To find the sum of the interior angles of a polygon, you can use the formula:
\[
\text{Sum of interior angles} = (n - 2) \times 180
\]
where \( n \) is the number of sides in the polygon.
For a hendecagon, which has 11 sides:
\[
\text{Sum of interior angles} = (11 - 2) \times 180
\]
\[
= 9 \times 180
\]
\[
= 1620
\]
Thus, the sum of the interior angles of a hendecagon is \( \boxed{1620} \) degrees.