16691679 has 12 divisors (see below), whose sum is σ = 24336936. Its totient is φ = 11023152.

The previous prime is 16691659. The next prime is 16691687. The reversal of 16691679 is 97619661.

It is not a de Polignac number, because 16691679 - 2⁹ = 16691167 is a prime.

It is a super-2 number, since 2×16691679² = 557224295678082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16691659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7704 + ... + 9629.

It is an arithmetic number, because the mean of its divisors is an integer number (2028078).

Almost surely, 2^16691679 is an apocalyptic number.

16691679 is a deficient number, since it is larger than the sum of its proper divisors (7645257).

16691679 is a wasteful number, since it uses less digits than its factorization.

16691679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17446 (or 17443 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 16691679 is about 4085.5451288659. The cubic root of 16691679 is about 255.5641948420.

The spelling of 16691679 in words is "sixteen million, six hundred ninety-one thousand, six hundred seventy-nine".