How do I display a long number (e.g. 112697826065989400628) as a result in scientific notation $${\mathtt{1.126\: \!9}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{20}}}$$ ?
Take a look at this page I think that it will help.
http://www.mathsisfun.com/numbers/scientific-notation.html
