666333394 has 16 divisors (see below), whose sum is σ = 1084108536. Its totient is φ = 305920000.

The previous prime is 666333383. The next prime is 666333397. The reversal of 666333394 is 493333666.

It can be written as a sum of positive squares in 4 ways, for example, as 589858369 + 76475025 = 24287^2 + 8745^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666333394.

It is not an unprimeable number, because it can be changed into a prime (666333397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237607 + ... + 240394.

Almost surely, 2^666333394 is an apocalyptic number.

666333394 is a deficient number, since it is larger than the sum of its proper divisors (417775142).

666333394 is a wasteful number, since it uses less digits than its factorization.

666333394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478061.

The product of its digits is 629856, while the sum is 43.

The square root of 666333394 is about 25813.4343704979. The cubic root of 666333394 is about 873.4348702268.

The spelling of 666333394 in words is "six hundred sixty-six million, three hundred thirty-three thousand, three hundred ninety-four".