12543185812 has 24 divisors (see below), whose sum is σ = 22048094376. Its totient is φ = 6243790848.

The previous prime is 12543185747. The next prime is 12543185813. The reversal of 12543185812 is 21858134521.

It can be written as a sum of positive squares in 4 ways, for example, as 6849879696 + 5693306116 = 82764^2 + 75454^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543185813) 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, 877668 + ... + 891844.

It is an arithmetic number, because the mean of its divisors is an integer number (918670599).

Almost surely, 2^12543185812 is an apocalyptic number.

It is an amenable number.

12543185812 is a deficient number, since it is larger than the sum of its proper divisors (9504908564).

12543185812 is a wasteful number, since it uses less digits than its factorization.

12543185812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15147 (or 15145 counting only the distinct ones).

The product of its digits is 76800, while the sum is 40.

The spelling of 12543185812 in words is "twelve billion, five hundred forty-three million, one hundred eighty-five thousand, eight hundred twelve".