12944778866 has 8 divisors (see below), whose sum is σ = 19436226480. Its totient is φ = 6466036708.

The previous prime is 12944778863. The next prime is 12944778881. The reversal of 12944778866 is 66887744921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12944778799 and 12944778808.

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 3 ways as a sum of consecutive naturals, for example, 3173816 + ... + 3177891.

It is an arithmetic number, because the mean of its divisors is an integer number (2429528310).

Almost surely, 2^12944778866 is an apocalyptic number.

12944778866 is a deficient number, since it is larger than the sum of its proper divisors (6491447614).

12944778866 is a wasteful number, since it uses less digits than its factorization.

12944778866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6352728.

The product of its digits is 32514048, while the sum is 62.

The spelling of 12944778866 in words is "twelve billion, nine hundred forty-four million, seven hundred seventy-eight thousand, eight hundred sixty-six".