16321968899 has 4 divisors (see below), whose sum is σ = 16365035160. Its totient is φ = 16278902640.

The previous prime is 16321968833. The next prime is 16321968907. The reversal of 16321968899 is 99886912361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16321968899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16321968599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21532562 + ... + 21533319.

It is an arithmetic number, because the mean of its divisors is an integer number (4091258790).

Almost surely, 2^16321968899 is an apocalyptic number.

16321968899 is a deficient number, since it is larger than the sum of its proper divisors (43066261).

16321968899 is an equidigital number, since it uses as much as digits as its factorization.

16321968899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43066260.

The product of its digits is 10077696, while the sum is 62.

The spelling of 16321968899 in words is "sixteen billion, three hundred twenty-one million, nine hundred sixty-eight thousand, eight hundred ninety-nine".