why number 8549176320 is one of a kind?

I am sure no one can have two things for dinner. what are they?

What is the longest word in the dictionary?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Can you find the mistake in the below statement?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Two trains start at the same time, one from Bangalore to Mysore and the other from Mysore to Bangalore. if they arrive at their destinations one hour and four hours respectively after passing one another, how much faster is one train running than the other?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

What is the word or phrase below?
R | E | A | D

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?