318742704967721 has 2 divisors, whose sum is σ = 318742704967722. Its totient is φ = 318742704967720.

The previous prime is 318742704967649. The next prime is 318742704967751. The reversal of 318742704967721 is 127769407247813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231343765380121 + 87398939587600 = 15209989^2 + 9348740^2 .

It is an emirp because it is prime and its reverse (127769407247813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318742704967721 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 (318742704967751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159371352483860 + 159371352483861.

It is an arithmetic number, because the mean of its divisors is an integer number (159371352483861).

Almost surely, 2^{318742704967721} is an apocalyptic number.

It is an amenable number.

318742704967721 is a deficient number, since it is larger than the sum of its proper divisors (1).

318742704967721 is an equidigital number, since it uses as much as digits as its factorization.

318742704967721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 199148544, while the sum is 68.

The spelling of 318742704967721 in words is "three hundred eighteen trillion, seven hundred forty-two billion, seven hundred four million, nine hundred sixty-seven thousand, seven hundred twenty-one".