18317065728 has 320 divisors, whose sum is σ = 54908485632. Its totient is φ = 5388042240.

The previous prime is 18317065727. The next prime is 18317065733. The reversal of 18317065728 is 82756071381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18317065727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78613900 + ... + 78614132.

Almost surely, 2^18317065728 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 18317065728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27454242816).

18317065728 is an abundant number, since it is smaller than the sum of its proper divisors (36591419904).

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

18317065728 is a wasteful number, since it uses less digits than its factorization.

18317065728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The spelling of 18317065728 in words is "eighteen billion, three hundred seventeen million, sixty-five thousand, seven hundred twenty-eight".