Alright, let's work through 25440897 times 61609377 step by step
25440897 × 61609377 = 61609377 × (25440897)
+ 61609377 × 7 that equals 431265639
+ 61609377 × 90 yielding 5544843930
+ 61609377 × 800 which equals 49287501600
+ 61609377 × 0000 giving us 0
+ 61609377 × 40000 that is equal 2464375080000
+ 61609377 × 400000 which equals 24643750800000
+ 61609377 × 5000000 producing 308046885000000
+ 61609377 × 20000000 which equals 1232187540000000

= 1567397814491169
