18355073717 has 2 divisors, whose sum is σ = 18355073718. Its totient is φ = 18355073716.

The previous prime is 18355073713. The next prime is 18355073731. The reversal of 18355073717 is 71737055381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12556098916 + 5798974801 = 112054^2 + 76151^2 .

It is an emirp because it is prime and its reverse (71737055381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18355073717 - 2² = 18355073713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18355073713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177536858 + 9177536859.

It is an arithmetic number, because the mean of its divisors is an integer number (9177536859).

Almost surely, 2^18355073717 is an apocalyptic number.

It is an amenable number.

18355073717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355073717 is an equidigital number, since it uses as much as digits as its factorization.

18355073717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 617400, while the sum is 47.

The spelling of 18355073717 in words is "eighteen billion, three hundred fifty-five million, seventy-three thousand, seven hundred seventeen".