16689679 has 4 divisors (see below), whose sum is σ = 16703584. Its totient is φ = 16675776.

The previous prime is 16689649. The next prime is 16689683. The reversal of 16689679 is 97698661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97698661 = 151 ⋅647011.

It is a cyclic number.

It is not a de Polignac number, because 16689679 - 2¹¹ = 16687631 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4962 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (4175896).

Almost surely, 2^16689679 is an apocalyptic number.

16689679 is a deficient number, since it is larger than the sum of its proper divisors (13905).

16689679 is a wasteful number, since it uses less digits than its factorization.

16689679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13904.

The product of its digits is 979776, while the sum is 52.

The square root of 16689679 is about 4085.3003561550. The cubic root of 16689679 is about 255.5539871849.

The spelling of 16689679 in words is "sixteen million, six hundred eighty-nine thousand, six hundred seventy-nine".