18320519736 has 80 divisors (see below), whose sum is σ = 51346785600. Its totient is φ = 6102988416.

The previous prime is 18320519683. The next prime is 18320519753. The reversal of 18320519736 is 63791502381.

18320519736 is a `hidden beast` number, since 1 + 83 + 20 + 519 + 7 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18320519691 and 18320519700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1131796 + ... + 1147868.

It is an arithmetic number, because the mean of its divisors is an integer number (641834820).

Almost surely, 2^18320519736 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 18320519736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25673392800).

18320519736 is an abundant number, since it is smaller than the sum of its proper divisors (33026265864).

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

18320519736 is a wasteful number, since it uses less digits than its factorization.

18320519736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17850 (or 17837 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 18320519736 in words is "eighteen billion, three hundred twenty million, five hundred nineteen thousand, seven hundred thirty-six".