18712427329 has 4 divisors (see below), whose sum is σ = 18713670340. Its totient is φ = 18711184320.

The previous prime is 18712427317. The next prime is 18712427341. The reversal of 18712427329 is 92372421781.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18712427317) and next prime (18712427341).

It can be written as a sum of positive squares in 2 ways, for example, as 5158112400 + 13554314929 = 71820^2 + 116423^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18712427329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18712427309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598644 + ... + 629125.

It is an arithmetic number, because the mean of its divisors is an integer number (4678417585).

Almost surely, 2^18712427329 is an apocalyptic number.

It is an amenable number.

18712427329 is a deficient number, since it is larger than the sum of its proper divisors (1243011).

18712427329 is a wasteful number, since it uses less digits than its factorization.

18712427329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243010.

The product of its digits is 338688, while the sum is 46.

The spelling of 18712427329 in words is "eighteen billion, seven hundred twelve million, four hundred twenty-seven thousand, three hundred twenty-nine".