18568421905 has 8 divisors (see below), whose sum is σ = 24307752384. Its totient is φ = 13504306800.

The previous prime is 18568421863. The next prime is 18568421951. The reversal of 18568421905 is 50912486581.

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

It is not a de Polignac number, because 18568421905 - 2¹³ = 18568413713 is a prime.

It is a Duffinian 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, 168803781 + ... + 168803890.

It is an arithmetic number, because the mean of its divisors is an integer number (3038469048).

Almost surely, 2^18568421905 is an apocalyptic number.

It is an amenable number.

18568421905 is a deficient number, since it is larger than the sum of its proper divisors (5739330479).

18568421905 is a wasteful number, since it uses less digits than its factorization.

18568421905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337607687.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 18568421905 in words is "eighteen billion, five hundred sixty-eight million, four hundred twenty-one thousand, nine hundred five".