16681885 has 8 divisors (see below), whose sum is σ = 21838176. Its totient is φ = 12132240.

The previous prime is 16681849. The next prime is 16681897. The reversal of 16681885 is 58818661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16681885 - 2¹⁵ = 16649117 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 151599 + ... + 151708.

It is an arithmetic number, because the mean of its divisors is an integer number (2729772).

Almost surely, 2^16681885 is an apocalyptic number.

It is an amenable number.

16681885 is a deficient number, since it is larger than the sum of its proper divisors (5156291).

16681885 is a wasteful number, since it uses less digits than its factorization.

16681885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303323.

The product of its digits is 92160, while the sum is 43.

The square root of 16681885 is about 4084.3463369308. The cubic root of 16681885 is about 255.5142001623.

It can be divided in two parts, 1668 and 1885, that added together give a palindrome (3553).

The spelling of 16681885 in words is "sixteen million, six hundred eighty-one thousand, eight hundred eighty-five".