16500621800 has 96 divisors (see below), whose sum is σ = 41348004600. Its totient is φ = 6087674880.

The previous prime is 16500621799. The next prime is 16500621803. The reversal of 16500621800 is 812600561.

It is a happy number.

16500621800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 192820996 + 16307800804 = 13886^2 + 127702^2 .

It is not an unprimeable number, because it can be changed into a prime (16500621803) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5898002 + ... + 5900798.

Almost surely, 2^16500621800 is an apocalyptic number.

16500621800 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 16500621800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20674002300).

16500621800 is an abundant number, since it is smaller than the sum of its proper divisors (24847382800).

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

16500621800 is a wasteful number, since it uses less digits than its factorization.

16500621800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5095 (or 5086 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 16500621800 in words is "sixteen billion, five hundred million, six hundred twenty-one thousand, eight hundred".