18038213689 has 2 divisors, whose sum is σ = 18038213690. Its totient is φ = 18038213688.

The previous prime is 18038213653. The next prime is 18038213729. The reversal of 18038213689 is 98631283081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17869005625 + 169208064 = 133675^2 + 13008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18038213689 - 2⁹ = 18038213177 is a prime.

It is not a weakly prime, because it can be changed into another prime (18038213189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9019106844 + 9019106845.

It is an arithmetic number, because the mean of its divisors is an integer number (9019106845).

Almost surely, 2^18038213689 is an apocalyptic number.

It is an amenable number.

18038213689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18038213689 is an equidigital number, since it uses as much as digits as its factorization.

18038213689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 18038213689 in words is "eighteen billion, thirty-eight million, two hundred thirteen thousand, six hundred eighty-nine".