18304836661 has 4 divisors (see below), whose sum is σ = 18310784800. Its totient is φ = 18298888524.

The previous prime is 18304836653. The next prime is 18304836709. The reversal of 18304836661 is 16663840381.

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: 16663840381 = 1361 ⋅12243821.

It is a cyclic number.

It is not a de Polignac number, because 18304836661 - 2³ = 18304836653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18304836611) 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, 2969451 + ... + 2975608.

It is an arithmetic number, because the mean of its divisors is an integer number (4577696200).

Almost surely, 2^18304836661 is an apocalyptic number.

It is an amenable number.

18304836661 is a deficient number, since it is larger than the sum of its proper divisors (5948139).

18304836661 is an equidigital number, since it uses as much as digits as its factorization.

18304836661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5948138.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 18304836661 in words is "eighteen billion, three hundred four million, eight hundred thirty-six thousand, six hundred sixty-one".