18043309079 has 4 divisors (see below), whose sum is σ = 18051691776. Its totient is φ = 18034926384.

The previous prime is 18043309073. The next prime is 18043309087. The reversal of 18043309079 is 97090334081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18043309079 - 2²⁰ = 18042260503 is a prime.

It is a super-2 number, since 2×18043309079² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043309073) 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 in 3 ways as a sum of consecutive naturals, for example, 4188119 + ... + 4192424.

It is an arithmetic number, because the mean of its divisors is an integer number (4512922944).

Almost surely, 2^18043309079 is an apocalyptic number.

18043309079 is a deficient number, since it is larger than the sum of its proper divisors (8382697).

18043309079 is an equidigital number, since it uses as much as digits as its factorization.

18043309079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382696.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 18043309079 in words is "eighteen billion, forty-three million, three hundred nine thousand, seventy-nine".