Obv it's mult of 450. Bijection to search for 45x. Obv it's mult of 90. Bijection to search for 9x. Obv by div rule, it's 111111111, so ans is $\boxed{11111111100}$.
It is a multiple of $25$, so the last two digits are $00$. It is also a multiple of $9$, so there must be a multiple of $9$ ones. Thus, the answer is $11111111100$.