18381590329 has 2 divisors, whose sum is σ = 18381590330. Its totient is φ = 18381590328.

The previous prime is 18381590321. The next prime is 18381590341. The reversal of 18381590329 is 92309518381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18354830400 + 26759929 = 135480^2 + 5173^2 .

It is a cyclic number.

It is not a de Polignac number, because 18381590329 - 2³ = 18381590321 is a prime.

It is not a weakly prime, because it can be changed into another prime (18381590321) 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, 9190795164 + 9190795165.

It is an arithmetic number, because the mean of its divisors is an integer number (9190795165).

Almost surely, 2^18381590329 is an apocalyptic number.

It is an amenable number.

18381590329 is a deficient number, since it is larger than the sum of its proper divisors (1).

18381590329 is an equidigital number, since it uses as much as digits as its factorization.

18381590329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 18381590329 in words is "eighteen billion, three hundred eighty-one million, five hundred ninety thousand, three hundred twenty-nine".