why number 8549176320 is one of a kind?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

When it's bad luck to meet a black cat?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What part of Turkey has the most feathers?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?