Power ^ ... ^ ...

It is of the general form $a_n = a_{n-1} + (n+1)^{n}$

Therefore $a_6 = a_5 + 7^6$ $a_6 =8476 + 117649$ $\boxed {126125}$

The next number in the series is 126125. The pattern is -

2 = 2^1

11 = 2^1 + 3^2

75 = 2^1 + 3^2 + 4^3

700 = 2^1 + 3^2 + 4^3 + 5^4

8476 = 2^1 + 3^2 + 4^3 + 5^4 + 6^5

126125 = 2^1 + 3^2 + 4^3 + 5^4 + 6^5 + 7^6