18703949717 has 2 divisors, whose sum is σ = 18703949718. Its totient is φ = 18703949716.

The previous prime is 18703949713. The next prime is 18703949741. The reversal of 18703949717 is 71794930781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11339907121 + 7364042596 = 106489^2 + 85814^2 .

It is a cyclic number.

It is not a de Polignac number, because 18703949717 - 2² = 18703949713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18703949711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351974858 + 9351974859.

It is an arithmetic number, because the mean of its divisors is an integer number (9351974859).

Almost surely, 2^18703949717 is an apocalyptic number.

It is an amenable number.

18703949717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18703949717 is an equidigital number, since it uses as much as digits as its factorization.

18703949717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 56.

The spelling of 18703949717 in words is "eighteen billion, seven hundred three million, nine hundred forty-nine thousand, seven hundred seventeen".