What is unique about the number 8,549,176,320?
It contains all digits from 0 to 9 in alphabetical order.
If you spell out the digits in English ('Eight', 'Five', 'Four', 'Nine', 'One', 'Seven', 'Six', 'Three', 'Two', 'Zero'), their first letters are in alphabetical order: E, F, F, N, O, S, S, T, T, Z.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
Five friends line up for a ride at the fair, and the sign lists only these facts. Hugo stands ahead of Luca. Nico stands ahead of Felix. Felix stands ahead of Hugo. Gwen stands ahead of Nico. Who stands first in line?
A water lily doubles in size every single day. If it takes 30 days for the lily to completely cover an entire pond, how many days did it take for the lily to cover exactly half of the same pond?
If you multiply me by any other single-digit number, the sum of the individual digits of the resulting product will always equal me. What number am I?
I am a five-letter word. If you remove my first letter, I become a sound made by a cat. If you remove my first two letters, I become a preposition of position. What word am I?
Five numbered cups (1 through 5) sit in order from left to right. A coin is hidden under an even-numbered cup. If you multiply the cup number immediately to its left by the cup number immediately to its right, the product is 3. Which cup holds the coin?
Four people need to cross a rickety rope bridge at night. They have only one flashlight, and the bridge can hold at most two people at a time. Their walking speeds are 1, 2, 7, and 10 minutes. What is the absolute minimum time required for all four to cross?