Scientific notation for exact numbers?

Some of my symbolic computations involve many large numbers, e.g.:


As the computation is symbolic, I’d like to leave the numbers in exact form, holding off the numerical conversion until the end.

This, however, makes the presentation of intermediate results unwieldy (especially if the expression contains a lot of large numbers). It would be nice if there were a function that caused an output to display all its over-threshold exact numbers in scientific notation, while keeping them exact internally. For instance in the case of the above, it would be:

3.78945801888 x 10^49

Wolfram’s documentation says “The Wolfram Language provides flexible mechanisms for full typeset formatting of numbers of any magnitude and precision”, but I’ve not been able to find a function that does this.