668382665 has 8 divisors (see below), whose sum is σ = 844272960. Its totient is φ = 506563632.

The previous prime is 668382647. The next prime is 668382667. The reversal of 668382665 is 566283866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668382665 - 2⁶ = 668382601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668382667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3517709 + ... + 3517898.

It is an arithmetic number, because the mean of its divisors is an integer number (105534120).

Almost surely, 2^668382665 is an apocalyptic number.

It is an amenable number.

668382665 is a deficient number, since it is larger than the sum of its proper divisors (175890295).

668382665 is a wasteful number, since it uses less digits than its factorization.

668382665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7035631.

The product of its digits is 2488320, while the sum is 50.

The square root of 668382665 is about 25853.0977834379. The cubic root of 668382665 is about 874.3293538679.

The spelling of 668382665 in words is "six hundred sixty-eight million, three hundred eighty-two thousand, six hundred sixty-five".