16681985 has 8 divisors (see below), whose sum is σ = 20075136. Its totient is φ = 13307760.

The previous prime is 16681949. The next prime is 16681991. The reversal of 16681985 is 58918661.

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

It is not a de Polignac number, because 16681985 - 2¹⁴ = 16665601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711 + ... + 6380.

It is an arithmetic number, because the mean of its divisors is an integer number (2509392).

Almost surely, 2^16681985 is an apocalyptic number.

It is an amenable number.

16681985 is a deficient number, since it is larger than the sum of its proper divisors (3393151).

16681985 is an equidigital number, since it uses as much as digits as its factorization.

16681985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463.

The product of its digits is 103680, while the sum is 44.

The square root of 16681985 is about 4084.3585787734. The cubic root of 16681985 is about 255.5147107235.

The spelling of 16681985 in words is "sixteen million, six hundred eighty-one thousand, nine hundred eighty-five".