17618645393 has 2 divisors, whose sum is σ = 17618645394. Its totient is φ = 17618645392.

The previous prime is 17618645381. The next prime is 17618645467. The reversal of 17618645393 is 39354681671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16355340544 + 1263304849 = 127888^2 + 35543^2 .

It is an emirp because it is prime and its reverse (39354681671) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17618645393 - 2⁶ = 17618645329 is a prime.

It is not a weakly prime, because it can be changed into another prime (17618635393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8809322696 + 8809322697.

It is an arithmetic number, because the mean of its divisors is an integer number (8809322697).

Almost surely, 2^17618645393 is an apocalyptic number.

It is an amenable number.

17618645393 is a deficient number, since it is larger than the sum of its proper divisors (1).

17618645393 is an equidigital number, since it uses as much as digits as its factorization.

17618645393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The spelling of 17618645393 in words is "seventeen billion, six hundred eighteen million, six hundred forty-five thousand, three hundred ninety-three".