Pick the odd man out in the given number series? 2 4 27 256 3125 46656

Here the given number series is 2 4 27 256 3125 46656

It follows a pattern that,

$11 = 122 = 433 = 2744 = 25655 = 312566 = 46656$

Hence the wrong number in the given number series is 2 instead of 1.