16444523728609 has 2 divisors, whose sum is σ = 16444523728610. Its totient is φ = 16444523728608.

The previous prime is 16444523728537. The next prime is 16444523728637. The reversal of 16444523728609 is 90682732544461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10275743136400 + 6168780592209 = 3205580^2 + 2483703^2 .

It is a cyclic number.

It is not a de Polignac number, because 16444523728609 - 2⁷ = 16444523728481 is a prime.

It is not a weakly prime, because it can be changed into another prime (16444523728649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8222261864304 + 8222261864305.

It is an arithmetic number, because the mean of its divisors is an integer number (8222261864305).

It is a 1-persistent number, because it is pandigital, but 2⋅16444523728609 = 32889047457218 is not.

Almost surely, 2^{16444523728609} is an apocalyptic number.

It is an amenable number.

16444523728609 is a deficient number, since it is larger than the sum of its proper divisors (1).

16444523728609 is an equidigital number, since it uses as much as digits as its factorization.

16444523728609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69672960, while the sum is 61.

The spelling of 16444523728609 in words is "sixteen trillion, four hundred forty-four billion, five hundred twenty-three million, seven hundred twenty-eight thousand, six hundred nine".