16639717 has 2 divisors, whose sum is σ = 16639718. Its totient is φ = 16639716.

The previous prime is 16639709. The next prime is 16639759. The reversal of 16639717 is 71793661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 2268036 = 3791^2 + 1506^2 .

It is an emirp because it is prime and its reverse (71793661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16639717 - 2³ = 16639709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16639717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16633717) 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 as a sum of consecutive naturals, namely, 8319858 + 8319859.

It is an arithmetic number, because the mean of its divisors is an integer number (8319859).

Almost surely, 2^16639717 is an apocalyptic number.

It is an amenable number.

16639717 is a deficient number, since it is larger than the sum of its proper divisors (1).

16639717 is an equidigital number, since it uses as much as digits as its factorization.

16639717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 40.

The square root of 16639717 is about 4079.1809226853. The cubic root of 16639717 is about 255.2987246315.

The spelling of 16639717 in words is "sixteen million, six hundred thirty-nine thousand, seven hundred seventeen".