16565000000 has 112 divisors (see below), whose sum is σ = 41101261968. Its totient is φ = 6624000000.

The previous prime is 16564999991. The next prime is 16565000003. The reversal of 16565000000 is 56561.

It can be written as a sum of positive squares in 8 ways, for example, as 15603007744 + 961992256 = 124912^2 + 31016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16565000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16565000003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4998344 + ... + 5001656.

Almost surely, 2^16565000000 is an apocalyptic number.

16565000000 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 16565000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20550630984).

16565000000 is an abundant number, since it is smaller than the sum of its proper divisors (24536261968).

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

16565000000 is an frugal number, since it uses more digits than its factorization.

16565000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 16565000000 its reverse (56561), we get a palindrome (16565056561).

The spelling of 16565000000 in words is "sixteen billion, five hundred sixty-five million", and thus it is an aban number.