18033938520 has 128 divisors (see below), whose sum is σ = 58302720000. Its totient is φ = 4436135424.

The previous prime is 18033938513. The next prime is 18033938551. The reversal of 18033938520 is 2583933081.

It is a congruent number.

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, 3115549 + ... + 3121331.

It is an arithmetic number, because the mean of its divisors is an integer number (455490000).

Almost surely, 2^18033938520 is an apocalyptic number.

18033938520 is a gapful number since it is divisible by the number (10) 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 18033938520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29151360000).

18033938520 is an abundant number, since it is smaller than the sum of its proper divisors (40268781480).

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

18033938520 is a wasteful number, since it uses less digits than its factorization.

18033938520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7809 (or 7805 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 18033938520 in words is "eighteen billion, thirty-three million, nine hundred thirty-eight thousand, five hundred twenty".