16644539 has 2 divisors, whose sum is σ = 16644540. Its totient is φ = 16644538.

The previous prime is 16644527. The next prime is 16644553. The reversal of 16644539 is 93544661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16644539 - 2⁸ = 16644283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16644739) 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 as a sum of consecutive naturals, namely, 8322269 + 8322270.

It is an arithmetic number, because the mean of its divisors is an integer number (8322270).

Almost surely, 2^16644539 is an apocalyptic number.

16644539 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644539 is an equidigital number, since it uses as much as digits as its factorization.

16644539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 16644539 is about 4079.7719299000. The cubic root of 16644539 is about 255.3233831349.

The spelling of 16644539 in words is "sixteen million, six hundred forty-four thousand, five hundred thirty-nine".