17998143869 has 2 divisors, whose sum is σ = 17998143870. Its totient is φ = 17998143868.

The previous prime is 17998143833. The next prime is 17998143887. The reversal of 17998143869 is 96834189971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721899769 + 2276244100 = 125387^2 + 47710^2 .

It is a cyclic number.

It is not a de Polignac number, because 17998143869 - 2¹⁶ = 17998078333 is a prime.

It is a super-2 number, since 2×17998143869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17998143809) 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 as a sum of consecutive naturals, namely, 8999071934 + 8999071935.

It is an arithmetic number, because the mean of its divisors is an integer number (8999071935).

Almost surely, 2^17998143869 is an apocalyptic number.

It is an amenable number.

17998143869 is a deficient number, since it is larger than the sum of its proper divisors (1).

17998143869 is an equidigital number, since it uses as much as digits as its factorization.

17998143869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 65.

The spelling of 17998143869 in words is "seventeen billion, nine hundred ninety-eight million, one hundred forty-three thousand, eight hundred sixty-nine".