12688982781 has 16 divisors (see below), whose sum is σ = 17814935040. Its totient is φ = 8011468080.

The previous prime is 12688982773. The next prime is 12688982807. The reversal of 12688982781 is 18728988621.

It is not a de Polignac number, because 12688982781 - 2³ = 12688982773 is a prime.

It is a super-2 number, since 2×12688982781² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688982701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147006 + ... + 216768.

It is an arithmetic number, because the mean of its divisors is an integer number (1113433440).

Almost surely, 2^12688982781 is an apocalyptic number.

It is an amenable number.

12688982781 is a deficient number, since it is larger than the sum of its proper divisors (5125952259).

12688982781 is a wasteful number, since it uses less digits than its factorization.

12688982781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72976.

The product of its digits is 6193152, while the sum is 60.

The spelling of 12688982781 in words is "twelve billion, six hundred eighty-eight million, nine hundred eighty-two thousand, seven hundred eighty-one".