12543012543 has 32 divisors (see below), whose sum is σ = 17501349312. Its totient is φ = 7983360000.

The previous prime is 12543012499. The next prime is 12543012553. The reversal of 12543012543 is 34521034521.

It is not a de Polignac number, because 12543012543 - 2¹⁴ = 12542996159 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12543012543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543012553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1261893 + ... + 1271793.

It is an arithmetic number, because the mean of its divisors is an integer number (546917166).

Almost surely, 2^12543012543 is an apocalyptic number.

12543012543 is a deficient number, since it is larger than the sum of its proper divisors (4958336769).

12543012543 is a wasteful number, since it uses less digits than its factorization.

12543012543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 12543012543 in words is "twelve billion, five hundred forty-three million, twelve thousand, five hundred forty-three".