16663443 has 8 divisors (see below), whose sum is σ = 22434048. Its totient is φ = 11000904.

The previous prime is 16663441. The next prime is 16663453. The reversal of 16663443 is 34436661.

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

It is not a de Polignac number, because 16663443 - 2¹ = 16663441 is a prime.

It is a super-2 number, since 2×16663443² = 555340665228498, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16663441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26655 + ... + 27272.

It is an arithmetic number, because the mean of its divisors is an integer number (2804256).

Almost surely, 2^16663443 is an apocalyptic number.

16663443 is a deficient number, since it is larger than the sum of its proper divisors (5770605).

16663443 is a wasteful number, since it uses less digits than its factorization.

16663443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54033.

The product of its digits is 31104, while the sum is 33.

The square root of 16663443 is about 4082.0880686237. The cubic root of 16663443 is about 255.4200075614.

The spelling of 16663443 in words is "sixteen million, six hundred sixty-three thousand, four hundred forty-three".