16668644 has 12 divisors (see below), whose sum is σ = 29791104. Its totient is φ = 8156904.

The previous prime is 16668569. The next prime is 16668647. The reversal of 16668644 is 44686661.

It is not an unprimeable number, because it can be changed into a prime (16668647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44144 + ... + 44519.

It is an arithmetic number, because the mean of its divisors is an integer number (2482592).

Almost surely, 2^16668644 is an apocalyptic number.

It is an amenable number.

16668644 is a deficient number, since it is larger than the sum of its proper divisors (13122460).

16668644 is a wasteful number, since it uses less digits than its factorization.

16668644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88714 (or 88712 counting only the distinct ones).

The product of its digits is 165888, while the sum is 41.

The square root of 16668644 is about 4082.7250703421. The cubic root of 16668644 is about 255.4465787263.

The spelling of 16668644 in words is "sixteen million, six hundred sixty-eight thousand, six hundred forty-four".