This will be some number times 10^18, which depending on what system you use (American or European) it will be either quintillion (American) or trillion (European).
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The value of a digit in a number is called its place value.
digit
a long number
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 is called the digit.