12640547512 has 16 divisors (see below), whose sum is σ = 24102739800. Its totient is φ = 6213150240.

The previous prime is 12640547459. The next prime is 12640547533. The reversal of 12640547512 is 21574504621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13389939 + ... + 13390882.

Almost surely, 2^12640547512 is an apocalyptic number.

It is an amenable number.

12640547512 is a deficient number, since it is larger than the sum of its proper divisors (11462192288).

12640547512 is a wasteful number, since it uses less digits than its factorization.

12640547512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26780886 (or 26780882 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 12640547512 in words is "twelve billion, six hundred forty million, five hundred forty-seven thousand, five hundred twelve".