18905660717 has 2 divisors, whose sum is σ = 18905660718. Its totient is φ = 18905660716.

The previous prime is 18905660699. The next prime is 18905660729. The reversal of 18905660717 is 71706650981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18115544836 + 790115881 = 134594^2 + 28109^2 .

It is a cyclic number.

It is not a de Polignac number, because 18905660717 - 2¹⁴ = 18905644333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18901660717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452830358 + 9452830359.

It is an arithmetic number, because the mean of its divisors is an integer number (9452830359).

Almost surely, 2^18905660717 is an apocalyptic number.

It is an amenable number.

18905660717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18905660717 is an equidigital number, since it uses as much as digits as its factorization.

18905660717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 18905660717 in words is "eighteen billion, nine hundred five million, six hundred sixty thousand, seven hundred seventeen".