2356759•5378639+1537638

To calculate \( 2356759 \times 5378639 + 1537638 \), we first perform the multiplication, then add the result to 1537638.

1. Calculate \( 2356759 \times 5378639 \): \[ 2356759 \times 5378639 = 12637394244081 \]

2. Now, add \( 1537638 \): \[ 12637394244081 + 1537638 = 12637394245619 \]

Thus, the final result is: \[ \boxed{12637394245619} \]