191668679 has 16 divisors (see below), whose sum is σ = 199618560. Its totient is φ = 183926400.

The previous prime is 191668669. The next prime is 191668681. The reversal of 191668679 is 976866191.

It is a cyclic number.

It is not a de Polignac number, because 191668679 - 2⁸ = 191668423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191668679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191668669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801842 + ... + 802080.

It is an arithmetic number, because the mean of its divisors is an integer number (12476160).

Almost surely, 2^191668679 is an apocalyptic number.

191668679 is a deficient number, since it is larger than the sum of its proper divisors (7949881).

191668679 is a wasteful number, since it uses less digits than its factorization.

191668679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its digits is 979776, while the sum is 53.

The square root of 191668679 is about 13844.4457816122. The cubic root of 191668679 is about 576.5677984727.

The spelling of 191668679 in words is "one hundred ninety-one million, six hundred sixty-eight thousand, six hundred seventy-nine".