16663138 has 8 divisors (see below), whose sum is σ = 25604460. Its totient is φ = 8128320.

The previous prime is 16663121. The next prime is 16663159. The reversal of 16663138 is 83136661.

It is a happy number.

16663138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16621929 + 41209 = 4077^2 + 203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101523 + ... + 101686.

Almost surely, 2^16663138 is an apocalyptic number.

16663138 is a deficient number, since it is larger than the sum of its proper divisors (8941322).

16663138 is a wasteful number, since it uses less digits than its factorization.

16663138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203252.

The product of its digits is 15552, while the sum is 34.

The square root of 16663138 is about 4082.0507101211. The cubic root of 16663138 is about 255.4184491885.

Adding to 16663138 its reverse (83136661), we get a palindrome (99799799).

The spelling of 16663138 in words is "sixteen million, six hundred sixty-three thousand, one hundred thirty-eight".