18538740216 has 192 divisors, whose sum is σ = 54054000000. Its totient is φ = 5945498496.

The previous prime is 18538740191. The next prime is 18538740217. The reversal of 18538740216 is 61204783581.

18538740216 is a `hidden beast` number, since 18 + 5 + 387 + 40 + 216 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18538740217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28131295 + ... + 28131953.

It is an arithmetic number, because the mean of its divisors is an integer number (281531250).

Almost surely, 2^18538740216 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 18538740216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27027000000).

18538740216 is an abundant number, since it is smaller than the sum of its proper divisors (35515259784).

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

18538740216 is a wasteful number, since it uses less digits than its factorization.

18538740216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1192 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 18538740216 in words is "eighteen billion, five hundred thirty-eight million, seven hundred forty thousand, two hundred sixteen".