12541778237117 has 2 divisors, whose sum is σ = 12541778237118. Its totient is φ = 12541778237116.

The previous prime is 12541778237077. The next prime is 12541778237167. The reversal of 12541778237117 is 71173287714521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9098270799556 + 3443507437561 = 3016334^2 + 1855669^2 .

It is a cyclic number.

It is not a de Polignac number, because 12541778237117 - 2⁸ = 12541778236861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12541778237167) 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, 6270889118558 + 6270889118559.

It is an arithmetic number, because the mean of its divisors is an integer number (6270889118559).

Almost surely, 2^{12541778237117} is an apocalyptic number.

It is an amenable number.

12541778237117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12541778237117 is an equidigital number, since it uses as much as digits as its factorization.

12541778237117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4609920, while the sum is 56.

The spelling of 12541778237117 in words is "twelve trillion, five hundred forty-one billion, seven hundred seventy-eight million, two hundred thirty-seven thousand, one hundred seventeen".