\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{fit,positioning, shapes,snakes}
\usepackage{amsmath,amssymb}


\tikzstyle{vennbox} = [draw,ultra thick,align=left,draw=black, very thick,  rounded corners=10, inner sep=10pt, inner ysep=20pt]
\tikzstyle{venntitle} =[fill=black, text=white]

\begin{document}

\begin{tikzpicture}[node distance=20pt]
\node [vennbox] (natural){%
	$0$ \ \  $1$ \ \ $12$ \ \  $350$ \ \  $48$ \ \ $5$ \ \  $16$
};



\node[left=of natural, inner sep=0pt] (integersExN) {
	$-1$ \ \  $-5$ \ \ $-10$ \ \  $-39$


};

\node [vennbox, fit=(integersExN) (natural)] (integers) {};

\node[below=of integers, inner sep=0pt] (rationalExZ) {
    $25{,}3401401401\dots$ \ \  $-0{,}101232323\dots$ \ \ $48{,}259$ \ \
};

\node[right=of integers, inner sep=0pt] (rationalExZ2) {
	$\dfrac{2}{5}$
};

\node[below right=of integers, inner sep=0pt] (rationalExZ3) {
	$-\dfrac{7}{3}$
};

\node [vennbox, fit=(rationalExZ) (integers) (rationalExZ2) (rationalExZ3)] (rational) {};

\node[above=of rational, inner sep=0pt] (irrational) {
     $6{,}1010010001\dots$ \ \ $-0{,}1234567\dots$
};

\node[above right=of rational, inner sep=0pt] (irrational2) {
	$\sqrt{2}$
};

\node[right=of rational, inner sep=0pt] (irrational3) {
	$\pi$
};

\node [vennbox, fit=(irrational) (rational) (irrational3) (irrational2)] (real) {};

\node[venntitle, right=10pt] at (integers.north west) {Integer};
\node[venntitle, above=10pt, rounded corners] at (integers.east) {$\mathbb{Z}$};
\node[venntitle, right=10pt] at (natural.north west) {natural};
\node[venntitle, rounded corners] at (natural.east) {$\mathbb{N}$};

\node[venntitle, right=10pt] at (rational.north west) {rational};
\node[venntitle, rounded corners] at (rational.east) {$\mathbb{Q}$};
\node[venntitle, right=10pt] at (real.north west) {real};
\node[venntitle, rounded corners] at (real.east) {$\mathbb{R}$};
\end{tikzpicture}


\end{document}