16681866 has 16 divisors (see below), whose sum is σ = 33708864. Its totient is φ = 5503104.

The previous prime is 16681849. The next prime is 16681897. The reversal of 16681866 is 66818661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13750 + ... + 14913.

It is an arithmetic number, because the mean of its divisors is an integer number (2106804).

Almost surely, 2^16681866 is an apocalyptic number.

16681866 is an abundant number, since it is smaller than the sum of its proper divisors (17026998).

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

16681866 is a wasteful number, since it uses less digits than its factorization.

16681866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28765.

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

The square root of 16681866 is about 4084.3440109765. The cubic root of 16681866 is about 255.5141031555.

The spelling of 16681866 in words is "sixteen million, six hundred eighty-one thousand, eight hundred sixty-six".