18220771329 has 16 divisors (see below), whose sum is σ = 24338662272. Its totient is φ = 12125055488.

The previous prime is 18220771319. The next prime is 18220771339. The reversal of 18220771329 is 92317702281.

It is an interprime number because it is at equal distance from previous prime (18220771319) and next prime (18220771339).

It is a cyclic number.

It is not a de Polignac number, because 18220771329 - 2⁴ = 18220771313 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18220771319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5035729 + ... + 5039345.

It is an arithmetic number, because the mean of its divisors is an integer number (1521166392).

Almost surely, 2^18220771329 is an apocalyptic number.

It is an amenable number.

18220771329 is a deficient number, since it is larger than the sum of its proper divisors (6117890943).

18220771329 is a wasteful number, since it uses less digits than its factorization.

18220771329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 18220771329 in words is "eighteen billion, two hundred twenty million, seven hundred seventy-one thousand, three hundred twenty-nine".