16916036721 has 4 divisors (see below), whose sum is σ = 22554715632. Its totient is φ = 11277357812.

The previous prime is 16916036689. The next prime is 16916036723. The reversal of 16916036721 is 12763061961.

16916036721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16916036721 - 2⁵ = 16916036689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16916036723) 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 3 ways as a sum of consecutive naturals, for example, 2819339451 + ... + 2819339456.

It is an arithmetic number, because the mean of its divisors is an integer number (5638678908).

Almost surely, 2^16916036721 is an apocalyptic number.

It is an amenable number.

16916036721 is a deficient number, since it is larger than the sum of its proper divisors (5638678911).

16916036721 is an equidigital number, since it uses as much as digits as its factorization.

16916036721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638678910.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 16916036721 in words is "sixteen billion, nine hundred sixteen million, thirty-six thousand, seven hundred twenty-one".