668530946 has 4 divisors (see below), whose sum is σ = 1002796422. Its totient is φ = 334265472.

The previous prime is 668530937. The next prime is 668530957. The reversal of 668530946 is 649035866.

668530946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 649035866 = 2 ⋅324517933.

It can be written as a sum of positive squares in only one way, i.e., 373069225 + 295461721 = 19315^2 + 17189^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 668530946.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167132735 + ... + 167132738.

Almost surely, 2^668530946 is an apocalyptic number.

668530946 is a deficient number, since it is larger than the sum of its proper divisors (334265476).

668530946 is a wasteful number, since it uses less digits than its factorization.

668530946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334265475.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 668530946 is about 25855.9653851872. The cubic root of 668530946 is about 874.3940058761.

The spelling of 668530946 in words is "six hundred sixty-eight million, five hundred thirty thousand, nine hundred forty-six".