16681568 has 12 divisors (see below), whose sum is σ = 32841900. Its totient is φ = 8340768.

The previous prime is 16681523. The next prime is 16681579. The reversal of 16681568 is 86518661.

It is a happy number.

16681568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260618 + ... + 260681.

It is an arithmetic number, because the mean of its divisors is an integer number (2736825).

Almost surely, 2^16681568 is an apocalyptic number.

It is an amenable number.

16681568 is a deficient number, since it is larger than the sum of its proper divisors (16160332).

16681568 is an equidigital number, since it uses as much as digits as its factorization.

16681568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521309 (or 521301 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 16681568 is about 4084.3075300472. The cubic root of 16681568 is about 255.5125816699.

The spelling of 16681568 in words is "sixteen million, six hundred eighty-one thousand, five hundred sixty-eight".