Next term in the pattern

Question

$22+22=4444$

$43+46=618191$

$77+77=?$

What should come in place of $?$

I cannot see any logic in $43+46=618191$. Is there any?

Answer 1

Please check your puzzle again if $43+46$ is actually $618198$

If not then expanding on @Daniel's comment

$$22+22=(\text{reverse digits}(2*2))(\text{reverse digits}(2*2))[22+22+(2*2-2*2)]=4444$$

$$43+46=(\text{reverse digits}(4*4))(\text{reverse digits}(3*6))[(43+46+\left(6*3-4*4\right))]=618191$$

So the number of $77+77=\text{reverse}(7*7)\text{Reverse}(7*7)\text{reverse}(77+77+\left(7*7-7*7\right))=9494154$

Answer 2

If you had $43+46=618198$ then I can see the following pattern: $$\color{red}{4}\color{blue}{3}+\color{red}{4}\color{blue}{6}=\color{red}{\text{reverse(4*4)}}\color{blue}{\text{reverse(3*6)}}\color{green}{\text{reverse(43+46)}}=\color{red}{61}\color{blue}{81}\color{green}{98}$$