191466666 has 20 divisors (see below), whose sum is σ = 429027522. Its totient is φ = 63822168.

The previous prime is 191466607. The next prime is 191466677. The reversal of 191466666 is 666664191.

191466666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 98903025 + 92563641 = 9945^2 + 9621^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

191466666 is a modest number, since divided by 66666 gives 1914 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 590785 + ... + 591108.

Almost surely, 2^191466666 is an apocalyptic number.

191466666 is an abundant number, since it is smaller than the sum of its proper divisors (237560856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191466666 is a wasteful number, since it uses less digits than its factorization.

191466666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181907 (or 1181898 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 191466666 is about 13837.1480443045. The cubic root of 191466666 is about 576.3651655832.

The spelling of 191466666 in words is "one hundred ninety-one million, four hundred sixty-six thousand, six hundred sixty-six".