16678693 has 4 divisors (see below), whose sum is σ = 16766208. Its totient is φ = 16591180.

The previous prime is 16678679. The next prime is 16678721. The reversal of 16678693 is 39687661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39687661 = 13 ⋅3052897.

It is a cyclic number.

It is not a de Polignac number, because 16678693 - 2⁵ = 16678661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16678603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43471 + ... + 43852.

It is an arithmetic number, because the mean of its divisors is an integer number (4191552).

Almost surely, 2^16678693 is an apocalyptic number.

It is an amenable number.

16678693 is a deficient number, since it is larger than the sum of its proper divisors (87515).

16678693 is an equidigital number, since it uses as much as digits as its factorization.

16678693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87514.

The product of its digits is 326592, while the sum is 46.

The square root of 16678693 is about 4083.9555580344. The cubic root of 16678693 is about 255.4979019771.

It can be divided in two parts, 16678 and 693, that added together give a palindrome (17371).

The spelling of 16678693 in words is "sixteen million, six hundred seventy-eight thousand, six hundred ninety-three".