16669603 has 4 divisors (see below), whose sum is σ = 16756168. Its totient is φ = 16583040.

The previous prime is 16669591. The next prime is 16669607. The reversal of 16669603 is 30696661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30696661 = 347 ⋅88463.

It is a cyclic number.

It is not a de Polignac number, because 16669603 - 2⁹ = 16669091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16669607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42993 + ... + 43378.

It is an arithmetic number, because the mean of its divisors is an integer number (4189042).

Almost surely, 2^16669603 is an apocalyptic number.

16669603 is a deficient number, since it is larger than the sum of its proper divisors (86565).

16669603 is an equidigital number, since it uses as much as digits as its factorization.

16669603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86564.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 16669603 is about 4082.8425147194. The cubic root of 16669603 is about 255.4514775165.

The spelling of 16669603 in words is "sixteen million, six hundred sixty-nine thousand, six hundred three".