15551144425 has 12 divisors (see below), whose sum is σ = 19389962956. Its totient is φ = 12372177600.

The previous prime is 15551144419. The next prime is 15551144429. The reversal of 15551144425 is 52444115551.

It can be written as a sum of positive squares in 6 ways, for example, as 1874543616 + 13676600809 = 43296^2 + 116947^2 .

It is not a de Polignac number, because 15551144425 - 2²³ = 15542755817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551144429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1713834 + ... + 1722883.

Almost surely, 2^15551144425 is an apocalyptic number.

It is an amenable number.

15551144425 is a deficient number, since it is larger than the sum of its proper divisors (3838818531).

15551144425 is a wasteful number, since it uses less digits than its factorization.

15551144425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436908 (or 3436903 counting only the distinct ones).

The product of its digits is 80000, while the sum is 37.

Adding to 15551144425 its reverse (52444115551), we get a palindrome (67995259976).

The spelling of 15551144425 in words is "fifteen billion, five hundred fifty-one million, one hundred forty-four thousand, four hundred twenty-five".