Gravitational binding energy of the sun?

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Could anyone give me a figure (in joules/kilo joules) for this?

Wikipedia says (on it's gravitational binding energy page) that the gravitational binding energy of a star is equal to about two times it's internal thermal energy.

I looked for "internal thermal energy" and could not find anything on it at all. I found figures for earth's gravitational binding energy, but not for the sun.

There's a formula you can do to work it out, but my knowledge of maths is the layman's type, not the type with the "weird symbols" so I would have to have them explained to me.
 

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