18425916689 has 2 divisors, whose sum is σ = 18425916690. Its totient is φ = 18425916688.

The previous prime is 18425916671. The next prime is 18425916709. The reversal of 18425916689 is 98661952481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16435240000 + 1990676689 = 128200^2 + 44617^2 .

It is an emirp because it is prime and its reverse (98661952481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18425916689 - 2¹⁶ = 18425851153 is a prime.

It is not a weakly prime, because it can be changed into another prime (18425916389) 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, 9212958344 + 9212958345.

It is an arithmetic number, because the mean of its divisors is an integer number (9212958345).

Almost surely, 2^18425916689 is an apocalyptic number.

It is an amenable number.

18425916689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18425916689 is an equidigital number, since it uses as much as digits as its factorization.

18425916689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 59.

The spelling of 18425916689 in words is "eighteen billion, four hundred twenty-five million, nine hundred sixteen thousand, six hundred eighty-nine".