Narcissistic or Armstrong Number

Question

Narcissistic number is a number that is the sum of its own digits each raised to the power of the number of digits. - wikipedia.

Example:
153 = 1^3 + 5^3 + 3^3
370 = 3^3 + 7^3 + 0^3

The largest known base 10 Narcissistic number is 39 digits long
115132219018763992565095597973971522401

Here's my solution to check if a number is narcissistic:
https://code.sololearn.com/cuKffMRrxnJK

Please suggest how to optimize it more.

Answer 1

Interesting. The number 9 is also a special number, the sum of all digits of any multiplication of 9 will give 9. 2*9 = 18, 1+8=9, 3*9=27, 2+7=9, 4*9=36, 3+6=9, etc. Also a kind of "narcissism." =)