Write a 6 digit whose hundred thousands digit is the greatest digit, the ones digit is the least digits and the rest of the digits are zero. How to write in figure

Answer 1

XXXXXX
000901

This follows your wording, but a number such as 000901 would be 901, making it a 3 digit number.

Does you number have decimals?
then how about 901.000 ?

Otherwise your question makes no sense