18129072529 has 2 divisors, whose sum is σ = 18129072530. Its totient is φ = 18129072528.

The previous prime is 18129072517. The next prime is 18129072587. The reversal of 18129072529 is 92527092181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15140810304 + 2988262225 = 123048^2 + 54665^2 .

It is an emirp because it is prime and its reverse (92527092181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18129072529 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (18129078529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064536264 + 9064536265.

It is an arithmetic number, because the mean of its divisors is an integer number (9064536265).

Almost surely, 2^18129072529 is an apocalyptic number.

It is an amenable number.

18129072529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129072529 is an equidigital number, since it uses as much as digits as its factorization.

18129072529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 18129072529 in words is "eighteen billion, one hundred twenty-nine million, seventy-two thousand, five hundred twenty-nine".