12918732709 has 2 divisors, whose sum is σ = 12918732710. Its totient is φ = 12918732708.

The previous prime is 12918732679. The next prime is 12918732737. The reversal of 12918732709 is 90723781921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8194232484 + 4724500225 = 90522^2 + 68735^2 .

It is a cyclic number.

It is not a de Polignac number, because 12918732709 - 2²⁵ = 12885178277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12918732809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459366354 + 6459366355.

It is an arithmetic number, because the mean of its divisors is an integer number (6459366355).

Almost surely, 2^12918732709 is an apocalyptic number.

It is an amenable number.

12918732709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12918732709 is an equidigital number, since it uses as much as digits as its factorization.

12918732709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 12918732709 in words is "twelve billion, nine hundred eighteen million, seven hundred thirty-two thousand, seven hundred nine".