16581382536 has 128 divisors (see below), whose sum is σ = 44304624000. Its totient is φ = 5156462592.

The previous prime is 16581382513. The next prime is 16581382549. The reversal of 16581382536 is 63528318561.

16581382536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×16581382536³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10128310 + ... + 10129946.

It is an arithmetic number, because the mean of its divisors is an integer number (346129875).

Almost surely, 2^16581382536 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 16581382536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22152312000).

16581382536 is an abundant number, since it is smaller than the sum of its proper divisors (27723241464).

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

16581382536 is a wasteful number, since it uses less digits than its factorization.

16581382536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991 (or 1987 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 48.

The spelling of 16581382536 in words is "sixteen billion, five hundred eighty-one million, three hundred eighty-two thousand, five hundred thirty-six".