12643520813 has 24 divisors (see below), whose sum is σ = 16307911584. Its totient is φ = 9690559200.

The previous prime is 12643520809. The next prime is 12643520861. The reversal of 12643520813 is 31802534621.

It is not a de Polignac number, because 12643520813 - 2² = 12643520809 is a prime.

It is a super-3 number, since 3×12643520813³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643520213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159395 + ... + 225152.

It is an arithmetic number, because the mean of its divisors is an integer number (679496316).

Almost surely, 2^12643520813 is an apocalyptic number.

It is an amenable number.

12643520813 is a deficient number, since it is larger than the sum of its proper divisors (3664390771).

12643520813 is a wasteful number, since it uses less digits than its factorization.

12643520813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384633 (or 384626 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 12643520813 in words is "twelve billion, six hundred forty-three million, five hundred twenty thousand, eight hundred thirteen".