18958174489 has 2 divisors, whose sum is σ = 18958174490. Its totient is φ = 18958174488.

The previous prime is 18958174481. The next prime is 18958174513. The reversal of 18958174489 is 98447185981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18530015625 + 428158864 = 136125^2 + 20692^2 .

It is a cyclic number.

It is not a de Polignac number, because 18958174489 - 2³ = 18958174481 is a prime.

It is a super-2 number, since 2×18958174489² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18958174489.

It is not a weakly prime, because it can be changed into another prime (18958174481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479087244 + 9479087245.

It is an arithmetic number, because the mean of its divisors is an integer number (9479087245).

Almost surely, 2^18958174489 is an apocalyptic number.

It is an amenable number.

18958174489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18958174489 is an equidigital number, since it uses as much as digits as its factorization.

18958174489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23224320, while the sum is 64.

The spelling of 18958174489 in words is "eighteen billion, nine hundred fifty-eight million, one hundred seventy-four thousand, four hundred eighty-nine".