If you use U. S. English, this number should normally be written out as follows if digits are to be avoided completely: "five trillion five hundred nine billion two million seventeen thousand eight hundred"; many Southerners would write, "five trillion five hundred and nine billion two million seventeen thousand and eight hundred"; some would add commas as follows, "five trillion, five hundred nine billion, two million, seventeen thousand, eight hundred". The Modern Language Association, however, recommends using digits for such large numbers, even in writing.
You write a number, not wright! It would be written as 75% of [the number].
To write 7 as an ordinal number, you would write it as "seventh."
To write the number in digits, you would write it like this: 95,032,659,004.
You write 2.875 as a mixed number as: 27/8
You would write it out in number form like this 6,000
MMMDC
You would write it exactly as in the question.
865,500,000,000 would be one way to write it. Another would be 8.655x10^11
You would write it like this 1.0761911
You would write it as 1.7x102
I would write 18,000,000 as eighteen million
93000000 is, itself a whole number so you would write it exactly as in the question.