12891693079986 has 256 divisors, whose sum is σ = 32801780736000. Its totient is φ = 3291057487872.

The previous prime is 12891693079943. The next prime is 12891693080089. The reversal of 12891693079986 is 68997039619821.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1423076725 + ... + 1423085783.

It is an arithmetic number, because the mean of its divisors is an integer number (128131956000).

Almost surely, 2^{12891693079986} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12891693079986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16400890368000).

12891693079986 is an abundant number, since it is smaller than the sum of its proper divisors (19910087656014).

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

12891693079986 is a wasteful number, since it uses less digits than its factorization.

12891693079986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9753.

The product of its (nonzero) digits is 634894848, while the sum is 78.

The spelling of 12891693079986 in words is "twelve trillion, eight hundred ninety-one billion, six hundred ninety-three million, seventy-nine thousand, nine hundred eighty-six".