16644417 has 8 divisors (see below), whose sum is σ = 22216896. Its totient is φ = 11084112.

The previous prime is 16644403. The next prime is 16644443. The reversal of 16644417 is 71444661.

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

It is not a de Polignac number, because 16644417 - 2¹¹ = 16642369 is a prime.

It is a super-3 number, since 3×16644417³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16604417) 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, 868 + ... + 5834.

It is an arithmetic number, because the mean of its divisors is an integer number (2777112).

Almost surely, 2^16644417 is an apocalyptic number.

It is an amenable number.

16644417 is a deficient number, since it is larger than the sum of its proper divisors (5572479).

16644417 is a wasteful number, since it uses less digits than its factorization.

16644417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087.

The product of its digits is 16128, while the sum is 33.

The square root of 16644417 is about 4079.7569780564. The cubic root of 16644417 is about 255.3227593161.

The spelling of 16644417 in words is "sixteen million, six hundred forty-four thousand, four hundred seventeen".