12543042440 has 16 divisors (see below), whose sum is σ = 28221845580. Its totient is φ = 5017216960.

The previous prime is 12543042403. The next prime is 12543042443. The reversal of 12543042440 is 4424034521.

It can be written as a sum of positive squares in 2 ways, for example, as 12392587684 + 150454756 = 111322^2 + 12266^2 .

It is not an unprimeable number, because it can be changed into a prime (12543042443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156787991 + ... + 156788070.

Almost surely, 2^12543042440 is an apocalyptic number.

12543042440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12543042440 is an abundant number, since it is smaller than the sum of its proper divisors (15678803140).

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

12543042440 is a wasteful number, since it uses less digits than its factorization.

12543042440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313576072 (or 313576068 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 12543042440 its reverse (4424034521), we get a palindrome (16967076961).

The spelling of 12543042440 in words is "twelve billion, five hundred forty-three million, forty-two thousand, four hundred forty".