18143281808 has 40 divisors (see below), whose sum is σ = 35702235000. Its totient is φ = 8930883584.

The previous prime is 18143281781. The next prime is 18143281837. The reversal of 18143281808 is 80818234181.

It is a Cunningham number, because it is equal to 134697²-1.

It can be written as a sum of positive squares in 4 ways, for example, as 4731788944 + 13411492864 = 68788^2 + 115808^2 .

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, 235718 + ... + 303066.

It is an arithmetic number, because the mean of its divisors is an integer number (892555875).

Almost surely, 2^18143281808 is an apocalyptic number.

It is an amenable number.

18143281808 is a deficient number, since it is larger than the sum of its proper divisors (17558953192).

18143281808 is a wasteful number, since it uses less digits than its factorization.

18143281808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67619 (or 67613 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 44.

The spelling of 18143281808 in words is "eighteen billion, one hundred forty-three million, two hundred eighty-one thousand, eight hundred eight".