17679999989 has 2 divisors, whose sum is σ = 17679999990. Its totient is φ = 17679999988.

The previous prime is 17679999941. The next prime is 17680000007. The reversal of 17679999989 is 98999997671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15467896900 + 2212103089 = 124370^2 + 47033^2 .

It is an emirp because it is prime and its reverse (98999997671) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17679999989 is a prime.

It is a super-2 number, since 2×17679999989² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17679999919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8839999994 + 8839999995.

It is an arithmetic number, because the mean of its divisors is an integer number (8839999995).

Almost surely, 2^17679999989 is an apocalyptic number.

It is an amenable number.

17679999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

17679999989 is an equidigital number, since it uses as much as digits as its factorization.

17679999989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1249949232, while the sum is 83.

The spelling of 17679999989 in words is "seventeen billion, six hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".