18538803712 has 320 divisors, whose sum is σ = 46279537920. Its totient is φ = 7299072000.

The previous prime is 18538803683. The next prime is 18538803733. The reversal of 18538803712 is 21730883581.

It is a super-3 number, since 3×18538803712³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170080714 + ... + 170080822.

It is an arithmetic number, because the mean of its divisors is an integer number (144623556).

Almost surely, 2^18538803712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18538803712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23139768960).

18538803712 is an abundant number, since it is smaller than the sum of its proper divisors (27740734208).

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

18538803712 is a wasteful number, since it uses less digits than its factorization.

18538803712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 18538803712 in words is "eighteen billion, five hundred thirty-eight million, eight hundred three thousand, seven hundred twelve".