393118666 has 4 divisors (see below), whose sum is σ = 589678002. Its totient is φ = 196559332.

The previous prime is 393118631. The next prime is 393118699. The reversal of 393118666 is 666811393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666811393 = 101 ⋅6602093.

It can be written as a sum of positive squares in only one way, i.e., 352350441 + 40768225 = 18771^2 + 6385^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98279665 + ... + 98279668.

Almost surely, 2^393118666 is an apocalyptic number.

393118666 is a deficient number, since it is larger than the sum of its proper divisors (196559336).

393118666 is a wasteful number, since it uses less digits than its factorization.

393118666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196559335.

The product of its digits is 139968, while the sum is 43.

The square root of 393118666 is about 19827.2203296377. The cubic root of 393118666 is about 732.5566612353.

The spelling of 393118666 in words is "three hundred ninety-three million, one hundred eighteen thousand, six hundred sixty-six".