12543042403 has 2 divisors, whose sum is σ = 12543042404. Its totient is φ = 12543042402.

The previous prime is 12543042397. The next prime is 12543042443. The reversal of 12543042403 is 30424034521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12543042403 - 2¹⁷ = 12542911331 is a prime.

It is not a weakly prime, because it can be changed into another prime (12543042443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271521201 + 6271521202.

It is an arithmetic number, because the mean of its divisors is an integer number (6271521202).

Almost surely, 2^12543042403 is an apocalyptic number.

12543042403 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543042403 is an equidigital number, since it uses as much as digits as its factorization.

12543042403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 12543042403 its reverse (30424034521), we get a palindrome (42967076924).

The spelling of 12543042403 in words is "twelve billion, five hundred forty-three million, forty-two thousand, four hundred three".