12678064991 has 16 divisors (see below), whose sum is σ = 13470322368. Its totient is φ = 11906611200.

The previous prime is 12678064981. The next prime is 12678064999. The reversal of 12678064991 is 19946087621.

It is a cyclic number.

It is not a de Polignac number, because 12678064991 - 2³⁰ = 11604323167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12678064999) 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, 801701 + ... + 817361.

It is an arithmetic number, because the mean of its divisors is an integer number (841895148).

Almost surely, 2^12678064991 is an apocalyptic number.

12678064991 is a deficient number, since it is larger than the sum of its proper divisors (792257377).

12678064991 is a wasteful number, since it uses less digits than its factorization.

12678064991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16322.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 12678064991 in words is "twelve billion, six hundred seventy-eight million, sixty-four thousand, nine hundred ninety-one".