18438479085 has 16 divisors (see below), whose sum is σ = 31770918144. Its totient is φ = 9077404992.

The previous prime is 18438479071. The next prime is 18438479113. The reversal of 18438479085 is 58097483481.

It is not a de Polignac number, because 18438479085 - 2⁸ = 18438478829 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, 47277957 + ... + 47278346.

It is an arithmetic number, because the mean of its divisors is an integer number (1985682384).

Almost surely, 2^18438479085 is an apocalyptic number.

18438479085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18438479085 is a deficient number, since it is larger than the sum of its proper divisors (13332439059).

18438479085 is a wasteful number, since it uses less digits than its factorization.

18438479085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94556324.

The product of its (nonzero) digits is 7741440, while the sum is 57.

The spelling of 18438479085 in words is "eighteen billion, four hundred thirty-eight million, four hundred seventy-nine thousand, eighty-five".