18909046805 has 8 divisors (see below), whose sum is σ = 24753661344. Its totient is φ = 13752034000.

The previous prime is 18909046799. The next prime is 18909046859. The reversal of 18909046805 is 50864090981.

It is a happy number.

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

It is not a de Polignac number, because 18909046805 - 2⁴ = 18909046789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171900371 + ... + 171900480.

It is an arithmetic number, because the mean of its divisors is an integer number (3094207668).

Almost surely, 2^18909046805 is an apocalyptic number.

It is an amenable number.

18909046805 is a deficient number, since it is larger than the sum of its proper divisors (5844614539).

18909046805 is a wasteful number, since it uses less digits than its factorization.

18909046805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343800867.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 18909046805 in words is "eighteen billion, nine hundred nine million, forty-six thousand, eight hundred five".