17989347205 has 16 divisors (see below), whose sum is σ = 21700168704. Its totient is φ = 14316341760.

The previous prime is 17989347203. The next prime is 17989347217. The reversal of 17989347205 is 50274398971.

It is a happy number.

It is not a de Polignac number, because 17989347205 - 2¹ = 17989347203 is a prime.

It is a super-2 number, since 2×17989347205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17989347203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 902052 + ... + 921778.

It is an arithmetic number, because the mean of its divisors is an integer number (1356260544).

Almost surely, 2^17989347205 is an apocalyptic number.

It is an amenable number.

17989347205 is a deficient number, since it is larger than the sum of its proper divisors (3710821499).

17989347205 is a wasteful number, since it uses less digits than its factorization.

17989347205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20676.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 17989347205 in words is "seventeen billion, nine hundred eighty-nine million, three hundred forty-seven thousand, two hundred five".