How to find power of a given number?

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65536= 4^8------( how can i find the base and power for a number.)

Now, if I am randomly given a number. Say, 4096 and I need to find a common base having some power. I mean a^n. Where a is the base and n is its power. So, accordingly answer for above number shall be 8^4.

Can you please give me some trick to find such bases and powers for a given number condition- Not to use factorization method or something which could be time consuming.