12891693179987 has 2 divisors, whose sum is σ = 12891693179988. Its totient is φ = 12891693179986.

The previous prime is 12891693179971. The next prime is 12891693180001. The reversal of 12891693179987 is 78997139619821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12891693179987 - 2⁴ = 12891693179971 is a prime.

It is not a weakly prime, because it can be changed into another prime (12891693179927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445846589993 + 6445846589994.

It is an arithmetic number, because the mean of its divisors is an integer number (6445846589994).

Almost surely, 2^{12891693179987} is an apocalyptic number.

12891693179987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891693179987 is an equidigital number, since it uses as much as digits as its factorization.

12891693179987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740710656, while the sum is 80.

The spelling of 12891693179987 in words is "twelve trillion, eight hundred ninety-one billion, six hundred ninety-three million, one hundred seventy-nine thousand, nine hundred eighty-seven".