12918732687 has 24 divisors (see below), whose sum is σ = 22116022656. Its totient is φ = 7382131992.

The previous prime is 12918732679. The next prime is 12918732709. The reversal of 12918732687 is 78623781921.

It is a happy number.

It is not a de Polignac number, because 12918732687 - 2³ = 12918732679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12918731687) 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, 3795693 + ... + 3799094.

It is an arithmetic number, because the mean of its divisors is an integer number (921500944).

Almost surely, 2^12918732687 is an apocalyptic number.

12918732687 is a deficient number, since it is larger than the sum of its proper divisors (9197289969).

12918732687 is an frugal number, since it uses more digits than its factorization.

12918732687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7594809 (or 7594797 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 12918732687 in words is "twelve billion, nine hundred eighteen million, seven hundred thirty-two thousand, six hundred eighty-seven".