12891693079985 has 16 divisors (see below), whose sum is σ = 15619939932864. Its totient is φ = 10213862795712.

The previous prime is 12891693079943. The next prime is 12891693080089. The reversal of 12891693079985 is 58997039619821.

It is a cyclic number.

It is not a de Polignac number, because 12891693079985 - 2¹⁰ = 12891693078961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27716402 + ... + 28177691.

It is an arithmetic number, because the mean of its divisors is an integer number (976246245804).

Almost surely, 2^{12891693079985} is an apocalyptic number.

It is an amenable number.

12891693079985 is a deficient number, since it is larger than the sum of its proper divisors (2728246852879).

12891693079985 is a wasteful number, since it uses less digits than its factorization.

12891693079985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55894544.

The product of its (nonzero) digits is 529079040, while the sum is 77.

The spelling of 12891693079985 in words is "twelve trillion, eight hundred ninety-one billion, six hundred ninety-three million, seventy-nine thousand, nine hundred eighty-five".