16663317 has 16 divisors (see below), whose sum is σ = 24803328. Its totient is φ = 9863280.

The previous prime is 16663307. The next prime is 16663321. The reversal of 16663317 is 71336661.

It is not a de Polignac number, because 16663317 - 2⁴ = 16663301 is a prime.

It is a super-2 number, since 2×16663317² = 555332266884978, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663307) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4453 + ... + 7290.

It is an arithmetic number, because the mean of its divisors is an integer number (1550208).

Almost surely, 2^16663317 is an apocalyptic number.

It is an amenable number.

16663317 is a deficient number, since it is larger than the sum of its proper divisors (8140011).

16663317 is a wasteful number, since it uses less digits than its factorization.

16663317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11800.

The product of its digits is 13608, while the sum is 33.

The square root of 16663317 is about 4082.0726353165. The cubic root of 16663317 is about 255.4193637769.

Adding to 16663317 its reverse (71336661), we get a palindrome (87999978).

The spelling of 16663317 in words is "sixteen million, six hundred sixty-three thousand, three hundred seventeen".