16649603 has 2 divisors, whose sum is σ = 16649604. Its totient is φ = 16649602.

The previous prime is 16649587. The next prime is 16649617. The reversal of 16649603 is 30694661.

It is a strong prime.

It is an emirp because it is prime and its reverse (30694661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16649603 - 2⁴ = 16649587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16649663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324801 + 8324802.

It is an arithmetic number, because the mean of its divisors is an integer number (8324802).

Almost surely, 2^16649603 is an apocalyptic number.

16649603 is a deficient number, since it is larger than the sum of its proper divisors (1).

16649603 is an equidigital number, since it uses as much as digits as its factorization.

16649603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 16649603 is about 4080.3925056298. The cubic root of 16649603 is about 255.3492740394.

The spelling of 16649603 in words is "sixteen million, six hundred forty-nine thousand, six hundred three".