18429389917 has 2 divisors, whose sum is σ = 18429389918. Its totient is φ = 18429389916.

The previous prime is 18429389863. The next prime is 18429389939. The reversal of 18429389917 is 71998392481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13392507076 + 5036882841 = 115726^2 + 70971^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429389917 - 2¹⁹ = 18428865629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18429389987) 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, 9214694958 + 9214694959.

It is an arithmetic number, because the mean of its divisors is an integer number (9214694959).

Almost surely, 2^18429389917 is an apocalyptic number.

It is an amenable number.

18429389917 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429389917 is an equidigital number, since it uses as much as digits as its factorization.

18429389917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 61.

The spelling of 18429389917 in words is "eighteen billion, four hundred twenty-nine million, three hundred eighty-nine thousand, nine hundred seventeen".