18119890805 has 8 divisors (see below), whose sum is σ = 21749814144. Its totient is φ = 14491949200.

The previous prime is 18119890799. The next prime is 18119890813. The reversal of 18119890805 is 50809891181.

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

It is not a de Polignac number, because 18119890805 - 2²⁶ = 18052781941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 475241 + ... + 511950.

It is an arithmetic number, because the mean of its divisors is an integer number (2718726768).

Almost surely, 2^18119890805 is an apocalyptic number.

It is an amenable number.

18119890805 is a deficient number, since it is larger than the sum of its proper divisors (3629923339).

18119890805 is an equidigital number, since it uses as much as digits as its factorization.

18119890805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990867.

The product of its (nonzero) digits is 207360, while the sum is 50.

The spelling of 18119890805 in words is "eighteen billion, one hundred nineteen million, eight hundred ninety thousand, eight hundred five".