12553644440 has 32 divisors (see below), whose sum is σ = 28264027680. Its totient is φ = 5018199552.

The previous prime is 12553644427. The next prime is 12553644443. The reversal of 12553644440 is 4444635521.

It is a junction number, because it is equal to n+sod(n) for n = 12553644394 and 12553644403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12553644443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38924 + ... + 163163.

It is an arithmetic number, because the mean of its divisors is an integer number (883250865).

Almost surely, 2^12553644440 is an apocalyptic number.

12553644440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12553644440 is an abundant number, since it is smaller than the sum of its proper divisors (15710383240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12553644440 is a wasteful number, since it uses less digits than its factorization.

12553644440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203651 (or 203647 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 12553644440 in words is "twelve billion, five hundred fifty-three million, six hundred forty-four thousand, four hundred forty".