12378085966109 has 2 divisors, whose sum is σ = 12378085966110. Its totient is φ = 12378085966108.

The previous prime is 12378085966067. The next prime is 12378085966139. The reversal of 12378085966109 is 90166958087321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9707100446884 + 2670985519225 = 3115622^2 + 1634315^2 .

It is a cyclic number.

It is not a de Polignac number, because 12378085966109 - 2²⁴ = 12378069188893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12378085966139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6189042983054 + 6189042983055.

It is an arithmetic number, because the mean of its divisors is an integer number (6189042983055).

Almost surely, 2^{12378085966109} is an apocalyptic number.

It is an amenable number.

12378085966109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12378085966109 is an equidigital number, since it uses as much as digits as its factorization.

12378085966109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 12378085966109 in words is "twelve trillion, three hundred seventy-eight billion, eighty-five million, nine hundred sixty-six thousand, one hundred nine".