18305334161 has 4 divisors (see below), whose sum is σ = 18306178800. Its totient is φ = 18304489524.

The previous prime is 18305334143. The next prime is 18305334167. The reversal of 18305334161 is 16143350381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16143350381 = 2767 ⋅5834243.

It is a cyclic number.

It is not a de Polignac number, because 18305334161 - 2³⁰ = 17231592337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18305334167) 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, 388931 + ... + 433448.

It is an arithmetic number, because the mean of its divisors is an integer number (4576544700).

Almost surely, 2^18305334161 is an apocalyptic number.

It is an amenable number.

18305334161 is a deficient number, since it is larger than the sum of its proper divisors (844639).

18305334161 is an equidigital number, since it uses as much as digits as its factorization.

18305334161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844638.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 18305334161 in words is "eighteen billion, three hundred five million, three hundred thirty-four thousand, one hundred sixty-one".