12878206846649 has 2 divisors, whose sum is σ = 12878206846650. Its totient is φ = 12878206846648.

The previous prime is 12878206846643. The next prime is 12878206846693. The reversal of 12878206846649 is 94664860287821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6504132102400 + 6374074744249 = 2550320^2 + 2524693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12878206846649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12878206846643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6439103423324 + 6439103423325.

It is an arithmetic number, because the mean of its divisors is an integer number (6439103423325).

Almost surely, 2^{12878206846649} is an apocalyptic number.

It is an amenable number.

12878206846649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12878206846649 is an equidigital number, since it uses as much as digits as its factorization.

12878206846649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 445906944, while the sum is 71.

The spelling of 12878206846649 in words is "twelve trillion, eight hundred seventy-eight billion, two hundred six million, eight hundred forty-six thousand, six hundred forty-nine".