16964730721 has 2 divisors, whose sum is σ = 16964730722. Its totient is φ = 16964730720.

The previous prime is 16964730719. The next prime is 16964730803. The reversal of 16964730721 is 12703746961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16409610000 + 555120721 = 128100^2 + 23561^2 .

It is a cyclic number.

It is not a de Polignac number, because 16964730721 - 2¹ = 16964730719 is a prime.

Together with 16964730719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16964730121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8482365360 + 8482365361.

It is an arithmetic number, because the mean of its divisors is an integer number (8482365361).

Almost surely, 2^16964730721 is an apocalyptic number.

It is an amenable number.

16964730721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16964730721 is an equidigital number, since it uses as much as digits as its factorization.

16964730721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 16964730721 in words is "sixteen billion, nine hundred sixty-four million, seven hundred thirty thousand, seven hundred twenty-one".