16668645 has 16 divisors (see below), whose sum is σ = 30480000. Its totient is φ = 7619904.

The previous prime is 16668569. The next prime is 16668647. The reversal of 16668645 is 54686661.

It is not a de Polignac number, because 16668645 - 2¹¹ = 16666597 is a prime.

It is a super-2 number, since 2×16668645² = 555687452272050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16668597 and 16668606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16668647) 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 15 ways as a sum of consecutive naturals, for example, 79270 + ... + 79479.

It is an arithmetic number, because the mean of its divisors is an integer number (1905000).

Almost surely, 2^16668645 is an apocalyptic number.

16668645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16668645 is a deficient number, since it is larger than the sum of its proper divisors (13811355).

16668645 is a wasteful number, since it uses less digits than its factorization.

16668645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158764.

The product of its digits is 207360, while the sum is 42.

The square root of 16668645 is about 4082.7251928093. The cubic root of 16668645 is about 255.4465838346.

The spelling of 16668645 in words is "sixteen million, six hundred sixty-eight thousand, six hundred forty-five".