12944778868 has 24 divisors (see below), whose sum is σ = 25891978112. Its totient is φ = 5547243744.

The previous prime is 12944778863. The next prime is 12944778881. The reversal of 12944778868 is 86887744921.

It is a super-2 number, since 2×12944778868² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12944778863) 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, 532630 + ... + 556402.

Almost surely, 2^12944778868 is an apocalyptic number.

It is an amenable number.

12944778868 is an abundant number, since it is smaller than the sum of its proper divisors (12947199244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12944778868 is a wasteful number, since it uses less digits than its factorization.

12944778868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43231 (or 43229 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 64.

The spelling of 12944778868 in words is "twelve billion, nine hundred forty-four million, seven hundred seventy-eight thousand, eight hundred sixty-eight".