18440523320 has 64 divisors (see below), whose sum is σ = 42683863680. Its totient is φ = 7166473216.

The previous prime is 18440523307. The next prime is 18440523323. The reversal of 18440523320 is 2332504481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440523323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221762 + ... + 293358.

It is an arithmetic number, because the mean of its divisors is an integer number (666935370).

Almost surely, 2^18440523320 is an apocalyptic number.

18440523320 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 18440523320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21341931840).

18440523320 is an abundant number, since it is smaller than the sum of its proper divisors (24243340360).

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

18440523320 is a wasteful number, since it uses less digits than its factorization.

18440523320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71792 (or 71788 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 18440523320 in words is "eighteen billion, four hundred forty million, five hundred twenty-three thousand, three hundred twenty".