To add the two numbers, we first convert \(1.691 \times 10^{10}\) into standard form.
1.691 × 10^{10} is equivalent to 16,910,000,000.
Now, we can perform the addition:
\[ 16,910,000,000 + 459,537,371,000 \]
Align the numbers for addition:
459,537,371,000
+ 16,910,000,000
--------------------
Now, adding the numbers gives:
\[ 459,537,371,000 + 16,910,000,000 = 476,447,371,000 \]
So, the result is:
\[ \boxed{476,447,371,000} \]