16663338 has 12 divisors (see below), whose sum is σ = 36103938. Its totient is φ = 5554440.

The previous prime is 16663321. The next prime is 16663351. The reversal of 16663338 is 83336661.

It can be written as a sum of positive squares in only one way, i.e., 10478169 + 6185169 = 3237^2 + 2487^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 462853 + ... + 462888.

Almost surely, 2^16663338 is an apocalyptic number.

16663338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16663338 is an abundant number, since it is smaller than the sum of its proper divisors (19440600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16663338 is a wasteful number, since it uses less digits than its factorization.

16663338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925749 (or 925746 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 16663338 is about 4082.0752075384. The cubic root of 16663338 is about 255.4194710745.

Adding to 16663338 its reverse (83336661), we get a palindrome (99999999).

It can be divided in two parts, 166 and 63338, that added together give a square (63504 = 252²).

The spelling of 16663338 in words is "sixteen million, six hundred sixty-three thousand, three hundred thirty-eight".