918744636217 has 2 divisors, whose sum is σ = 918744636218. Its totient is φ = 918744636216.

The previous prime is 918744636101. The next prime is 918744636239. The reversal of 918744636217 is 712636447819.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817253968441 + 101490667776 = 904021^2 + 318576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-918744636217 is a prime.

It is not a weakly prime, because it can be changed into another prime (918744636317) 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, 459372318108 + 459372318109.

It is an arithmetic number, because the mean of its divisors is an integer number (459372318109).

Almost surely, 2^918744636217 is an apocalyptic number.

It is an amenable number.

918744636217 is a deficient number, since it is larger than the sum of its proper divisors (1).

918744636217 is an equidigital number, since it uses as much as digits as its factorization.

918744636217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 58.

The spelling of 918744636217 in words is "nine hundred eighteen billion, seven hundred forty-four million, six hundred thirty-six thousand, two hundred seventeen".