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Seven.
A 400-digit number is typically referred to as a "400-digit number." In mathematics, numbers are categorized by their number of digits, such as single-digit numbers, double-digit numbers, triple-digit numbers, and so on. Therefore, a number with 400 digits would simply be called a "400-digit number."
It's been proven that pi is an irrational number. In other words, it can't bewritten with a finite number of digits, and there is no 'last digit'.
6.70
To write 0.583 in decimal words, you would say "five hundred eighty-three thousandths." This is because the digit 5 is in the hundredths place, the digit 8 is in the tenths place, and the digit 3 is in the thousandths place. Therefore, you read each digit as a number of thousandths.