18208539078912 has 3456 divisors, whose sum is σ = 75090142167040. Its totient is φ = 4266493378560.

The previous prime is 18208539078853. The next prime is 18208539078941. The reversal of 18208539078912 is 21987093580281.

18208539078912 is a `hidden beast` number, since 1 + 8 + 2 + 0 + 8 + 539 + 0 + 7 + 8 + 91 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (3456).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 18208539078912.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 143374323393 + ... + 143374323519.

Almost surely, 2^{18208539078912} is an apocalyptic number.

18208539078912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18208539078912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37545071083520).

18208539078912 is an abundant number, since it is smaller than the sum of its proper divisors (56881603088128).

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

18208539078912 is a wasteful number, since it uses less digits than its factorization.

18208539078912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 18208539078912 in words is "eighteen trillion, two hundred eight billion, five hundred thirty-nine million, seventy-eight thousand, nine hundred twelve".