318943743457 has 2 divisors, whose sum is σ = 318943743458. Its totient is φ = 318943743456.

The previous prime is 318943743449. The next prime is 318943743473. The reversal of 318943743457 is 754347349813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318407404176 + 536339281 = 564276^2 + 23159^2 .

It is an emirp because it is prime and its reverse (754347349813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318943743457 - 2³ = 318943743449 is a prime.

It is a super-3 number, since 3×318943743457³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (318943743427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159471871728 + 159471871729.

It is an arithmetic number, because the mean of its divisors is an integer number (159471871729).

Almost surely, 2^318943743457 is an apocalyptic number.

It is an amenable number.

318943743457 is a deficient number, since it is larger than the sum of its proper divisors (1).

318943743457 is an equidigital number, since it uses as much as digits as its factorization.

318943743457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 58.

The spelling of 318943743457 in words is "three hundred eighteen billion, nine hundred forty-three million, seven hundred forty-three thousand, four hundred fifty-seven".