16663668 has 24 divisors (see below), whose sum is σ = 44436672. Its totient is φ = 4761024.

The previous prime is 16663657. The next prime is 16663681. The reversal of 16663668 is 86636661.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99105 + ... + 99272.

It is an arithmetic number, because the mean of its divisors is an integer number (1851528).

Almost surely, 2^16663668 is an apocalyptic number.

It is an amenable number.

16663668 is an abundant number, since it is smaller than the sum of its proper divisors (27773004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16663668 is a wasteful number, since it uses less digits than its factorization.

16663668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198391 (or 198389 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 16663668 is about 4082.1156279557. The cubic root of 16663668 is about 255.4211571687.

The spelling of 16663668 in words is "sixteen million, six hundred sixty-three thousand, six hundred sixty-eight".