18655718317 has 2 divisors, whose sum is σ = 18655718318. Its totient is φ = 18655718316.

The previous prime is 18655718303. The next prime is 18655718363. The reversal of 18655718317 is 71381755681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17302508521 + 1353209796 = 131539^2 + 36786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18655718317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18655718717) 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, 9327859158 + 9327859159.

It is an arithmetic number, because the mean of its divisors is an integer number (9327859159).

Almost surely, 2^18655718317 is an apocalyptic number.

It is an amenable number.

18655718317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18655718317 is an equidigital number, since it uses as much as digits as its factorization.

18655718317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 52.

The spelling of 18655718317 in words is "eighteen billion, six hundred fifty-five million, seven hundred eighteen thousand, three hundred seventeen".