16321968900 has 54 divisors (see below), whose sum is σ = 51160307562. Its totient is φ = 4352524800.

The previous prime is 16321968833. The next prime is 16321968907. The reversal of 16321968900 is 986912361.

It is a happy number.

16321968900 is a `hidden beast` number, since 1 + 632 + 1 + 9 + 6 + 8 + 9 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 2810696256 + 13511272644 = 53016^2 + 116238^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (16321968907) 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 17 ways as a sum of consecutive naturals, for example, 9066861 + ... + 9068660.

It is an arithmetic number, because the mean of its divisors is an integer number (947413103).

Almost surely, 2^16321968900 is an apocalyptic number.

16321968900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16321968900 is an abundant number, since it is smaller than the sum of its proper divisors (34838338662).

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

16321968900 is a wasteful number, since it uses less digits than its factorization.

16321968900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18135541 (or 18135531 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 16321968900 in words is "sixteen billion, three hundred twenty-one million, nine hundred sixty-eight thousand, nine hundred".