18105885005 has 16 divisors (see below), whose sum is σ = 23405563440. Its totient is φ = 13366391808.

The previous prime is 18105884983. The next prime is 18105885047. The reversal of 18105885005 is 50058850181.

It can be written as a sum of positive squares in 8 ways, for example, as 1636526116 + 16469358889 = 40454^2 + 128333^2 .

It is a cyclic number.

It is not a de Polignac number, because 18105885005 - 2⁶ = 18105884941 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 179189 + ... + 261381.

It is an arithmetic number, because the mean of its divisors is an integer number (1462847715).

Almost surely, 2^18105885005 is an apocalyptic number.

It is an amenable number.

18105885005 is a deficient number, since it is larger than the sum of its proper divisors (5299678435).

18105885005 is a wasteful number, since it uses less digits than its factorization.

18105885005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85600.

The product of its (nonzero) digits is 64000, while the sum is 41.

The spelling of 18105885005 in words is "eighteen billion, one hundred five million, eight hundred eighty-five thousand, five".