18359807329 has 4 divisors (see below), whose sum is σ = 18366121620. Its totient is φ = 18353493040.

The previous prime is 18359807321. The next prime is 18359807377. The reversal of 18359807329 is 92370895381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7888992400 + 10470814929 = 88820^2 + 102327^2 .

It is a cyclic number.

It is not a de Polignac number, because 18359807329 - 2³ = 18359807321 is a prime.

It is a super-2 number, since 2×18359807329² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18359807329.

It is not an unprimeable number, because it can be changed into a prime (18359807321) 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, 3152782 + ... + 3158599.

It is an arithmetic number, because the mean of its divisors is an integer number (4591530405).

Almost surely, 2^18359807329 is an apocalyptic number.

It is an amenable number.

18359807329 is a deficient number, since it is larger than the sum of its proper divisors (6314291).

18359807329 is an equidigital number, since it uses as much as digits as its factorization.

18359807329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6314290.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 18359807329 in words is "eighteen billion, three hundred fifty-nine million, eight hundred seven thousand, three hundred twenty-nine".