12678549845891 has 2 divisors, whose sum is σ = 12678549845892. Its totient is φ = 12678549845890.

The previous prime is 12678549845837. The next prime is 12678549845921. The reversal of 12678549845891 is 19854894587621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12678549845891 - 2¹⁰ = 12678549844867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12678549845791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6339274922945 + 6339274922946.

It is an arithmetic number, because the mean of its divisors is an integer number (6339274922946).

Almost surely, 2^{12678549845891} is an apocalyptic number.

12678549845891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12678549845891 is an equidigital number, since it uses as much as digits as its factorization.

12678549845891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1393459200, while the sum is 77.

The spelling of 12678549845891 in words is "twelve trillion, six hundred seventy-eight billion, five hundred forty-nine million, eight hundred forty-five thousand, eight hundred ninety-one".