191668684 has 6 divisors (see below), whose sum is σ = 335420204. Its totient is φ = 95834340.

The previous prime is 191668681. The next prime is 191668699. The reversal of 191668684 is 486866191.

191668684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (191668681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23958582 + ... + 23958589.

Almost surely, 2^191668684 is an apocalyptic number.

It is an amenable number.

191668684 is a deficient number, since it is larger than the sum of its proper divisors (143751520).

191668684 is a wasteful number, since it uses less digits than its factorization.

191668684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47917175 (or 47917173 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 191668684 is about 13844.4459621900. The cubic root of 191668684 is about 576.5678034862.

The spelling of 191668684 in words is "one hundred ninety-one million, six hundred sixty-eight thousand, six hundred eighty-four".