16661203 has 12 divisors (see below), whose sum is σ = 18156528. Its totient is φ = 15281760.

The previous prime is 16661147. The next prime is 16661213. The reversal of 16661203 is 30216661.

It is a de Polignac number, because none of the positive numbers 2^k-16661203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16661213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52401 + ... + 52717.

It is an arithmetic number, because the mean of its divisors is an integer number (1513044).

Almost surely, 2^16661203 is an apocalyptic number.

16661203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16661203 is a deficient number, since it is larger than the sum of its proper divisors (1495325).

16661203 is a wasteful number, since it uses less digits than its factorization.

16661203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 16661203 is about 4081.8136900158. The cubic root of 16661203 is about 255.4085620185.

Adding to 16661203 its reverse (30216661), we get a palindrome (46877864).

The spelling of 16661203 in words is "sixteen million, six hundred sixty-one thousand, two hundred three".