16603 has 2 divisors, whose sum is σ = 16604. Its totient is φ = 16602.

The previous prime is 16573. The next prime is 16607. The reversal of 16603 is 30661.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (30661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16603 - 2⁹ = 16091 is a prime.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (16607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8301 + 8302.

It is an arithmetic number, because the mean of its divisors is an integer number (8302).

2¹⁶⁶⁰³ is an apocalyptic number.

16603 is a deficient number, since it is larger than the sum of its proper divisors (1).

16603 is an equidigital number, since it uses as much as digits as its factorization.

16603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 16603 is about 128.8526289992. The cubic root of 16603 is about 25.5110806643.

The spelling of 16603 in words is "sixteen thousand, six hundred three".