12944778867 has 24 divisors (see below), whose sum is σ = 19148091248. Its totient is φ = 8422444800.

The previous prime is 12944778863. The next prime is 12944778881. The reversal of 12944778867 is 76887744921.

12944778867 is a `hidden beast` number, since 1 + 29 + 4 + 477 + 88 + 67 = 666.

It is not a de Polignac number, because 12944778867 - 2² = 12944778863 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 498567 + ... + 523887.

Almost surely, 2^12944778867 is an apocalyptic number.

12944778867 is a deficient number, since it is larger than the sum of its proper divisors (6203312381).

12944778867 is a wasteful number, since it uses less digits than its factorization.

12944778867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26691 (or 26688 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The spelling of 12944778867 in words is "twelve billion, nine hundred forty-four million, seven hundred seventy-eight thousand, eight hundred sixty-seven".