666193394 has 32 divisors (see below), whose sum is σ = 1051142400. Its totient is φ = 316249920.

The previous prime is 666193387. The next prime is 666193403. The reversal of 666193394 is 493391666.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1055459 + ... + 1056089.

It is an arithmetic number, because the mean of its divisors is an integer number (32848200).

Almost surely, 2^666193394 is an apocalyptic number.

666193394 is a deficient number, since it is larger than the sum of its proper divisors (384949006).

666193394 is a wasteful number, since it uses less digits than its factorization.

666193394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its digits is 629856, while the sum is 47.

The square root of 666193394 is about 25810.7224617987. The cubic root of 666193394 is about 873.3736949213.

The spelling of 666193394 in words is "six hundred sixty-six million, one hundred ninety-three thousand, three hundred ninety-four".