how do i center the limits for multiple sum

Question

how do i center the limits for multiple sum like what we usually do for integral ,,, in other way, is there command like \idotsint for sum?

for example:

\sum\cdots\sum\limits_{n_1^2+n_2^2+...+n_N^2<\lambda}

Answer 1

There is now....

\documentclass{article}

\usepackage{amsmath}
\DeclareMathOperator*{\sdotsum}{\sum\cdots\sum}

\begin{document}
    \[
\sdotsum\limits_{n_1^2+n_2^2+...+n_N^2<\lambda}
    \]
\end{document}