18438317136 has 60 divisors (see below), whose sum is σ = 54317565120. Its totient is φ = 5822625600.

The previous prime is 18438317123. The next prime is 18438317159. The reversal of 18438317136 is 63171383481.

18438317136 is a `hidden beast` number, since 18 + 438 + 3 + 171 + 36 = 666.

It is a super-2 number, since 2×18438317136² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18438317091 and 18438317100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3366840 + ... + 3372311.

It is an arithmetic number, because the mean of its divisors is an integer number (905292752).

Almost surely, 2^18438317136 is an apocalyptic number.

18438317136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18438317136 is an abundant number, since it is smaller than the sum of its proper divisors (35879247984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18438317136 is a wasteful number, since it uses less digits than its factorization.

18438317136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739184 (or 6739175 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The spelling of 18438317136 in words is "eighteen billion, four hundred thirty-eight million, three hundred seventeen thousand, one hundred thirty-six".