17719649989 has 2 divisors, whose sum is σ = 17719649990. Its totient is φ = 17719649988.

The previous prime is 17719649939. The next prime is 17719650023. The reversal of 17719649989 is 98994691771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16033890625 + 1685759364 = 126625^2 + 41058^2 .

It is a cyclic number.

It is not a de Polignac number, because 17719649989 - 2¹⁵ = 17719617221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17719649939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8859824994 + 8859824995.

It is an arithmetic number, because the mean of its divisors is an integer number (8859824995).

Almost surely, 2^17719649989 is an apocalyptic number.

It is an amenable number.

17719649989 is a deficient number, since it is larger than the sum of its proper divisors (1).

17719649989 is an equidigital number, since it uses as much as digits as its factorization.

17719649989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 70.

The spelling of 17719649989 in words is "seventeen billion, seven hundred nineteen million, six hundred forty-nine thousand, nine hundred eighty-nine".