18039122729 has 2 divisors, whose sum is σ = 18039122730. Its totient is φ = 18039122728.

The previous prime is 18039122719. The next prime is 18039122743. The reversal of 18039122729 is 92722193081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18008298025 + 30824704 = 134195^2 + 5552^2 .

It is a cyclic number.

It is not a de Polignac number, because 18039122729 - 2²⁸ = 17770687273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18039122729.

It is not a weakly prime, because it can be changed into another prime (18039122719) 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, 9019561364 + 9019561365.

It is an arithmetic number, because the mean of its divisors is an integer number (9019561365).

Almost surely, 2^18039122729 is an apocalyptic number.

It is an amenable number.

18039122729 is a deficient number, since it is larger than the sum of its proper divisors (1).

18039122729 is an equidigital number, since it uses as much as digits as its factorization.

18039122729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 18039122729 in words is "eighteen billion, thirty-nine million, one hundred twenty-two thousand, seven hundred twenty-nine".