16643669 has 8 divisors (see below), whose sum is σ = 19046208. Its totient is φ = 14247360.

The previous prime is 16643659. The next prime is 16643707. The reversal of 16643669 is 96634661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16643669 is a prime.

It is a super-2 number, since 2×16643669² = 554023435563122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8654 + ... + 10400.

It is an arithmetic number, because the mean of its divisors is an integer number (2380776).

Almost surely, 2^16643669 is an apocalyptic number.

It is an amenable number.

16643669 is a deficient number, since it is larger than the sum of its proper divisors (2402539).

16643669 is a wasteful number, since it uses less digits than its factorization.

16643669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115.

The product of its digits is 139968, while the sum is 41.

The square root of 16643669 is about 4079.6653048994. The cubic root of 16643669 is about 255.3189345244.

The spelling of 16643669 in words is "sixteen million, six hundred forty-three thousand, six hundred sixty-nine".