16681668 has 48 divisors (see below), whose sum is σ = 40031040. Its totient is φ = 5405184.

The previous prime is 16681667. The next prime is 16681673. The reversal of 16681668 is 86618661.

It is not an unprimeable number, because it can be changed into a prime (16681661) 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, 119943 + ... + 120081.

It is an arithmetic number, because the mean of its divisors is an integer number (833980).

Almost surely, 2^16681668 is an apocalyptic number.

It is an amenable number.

16681668 is an abundant number, since it is smaller than the sum of its proper divisors (23349372).

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

16681668 is a wasteful number, since it uses less digits than its factorization.

16681668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 354 counting only the distinct ones).

The product of its digits is 82944, while the sum is 42.

The square root of 16681668 is about 4084.3197720061. The cubic root of 16681668 is about 255.5130922375.

The spelling of 16681668 in words is "sixteen million, six hundred eighty-one thousand, six hundred sixty-eight".