12109946478187 has 2 divisors, whose sum is σ = 12109946478188. Its totient is φ = 12109946478186.

The previous prime is 12109946478173. The next prime is 12109946478191. The reversal of 12109946478187 is 78187464990121.

12109946478187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12109946478187 is a prime.

It is not a weakly prime, because it can be changed into another prime (12109946478137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6054973239093 + 6054973239094.

It is an arithmetic number, because the mean of its divisors is an integer number (6054973239094).

Almost surely, 2^{12109946478187} is an apocalyptic number.

12109946478187 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109946478187 is an equidigital number, since it uses as much as digits as its factorization.

12109946478187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48771072, while the sum is 67.

The spelling of 12109946478187 in words is "twelve trillion, one hundred nine billion, nine hundred forty-six million, four hundred seventy-eight thousand, one hundred eighty-seven".