18173405081 has 8 divisors (see below), whose sum is σ = 20422288320. Its totient is φ = 16046083152.

The previous prime is 18173405077. The next prime is 18173405099. The reversal of 18173405081 is 18050437181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18173405081 - 2² = 18173405077 is a prime.

It is a super-2 number, since 2×18173405081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18173405281) 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 7 ways as a sum of consecutive naturals, for example, 30390011 + ... + 30390608.

It is an arithmetic number, because the mean of its divisors is an integer number (2552786040).

Almost surely, 2^18173405081 is an apocalyptic number.

It is an amenable number.

18173405081 is a deficient number, since it is larger than the sum of its proper divisors (2248883239).

18173405081 is a wasteful number, since it uses less digits than its factorization.

18173405081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60780655.

The product of its (nonzero) digits is 26880, while the sum is 38.

The spelling of 18173405081 in words is "eighteen billion, one hundred seventy-three million, four hundred five thousand, eighty-one".