668393007 has 8 divisors (see below), whose sum is σ = 894659376. Its totient is φ = 443860992.

The previous prime is 668393003. The next prime is 668393023. The reversal of 668393007 is 700393866.

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

It is not a de Polignac number, because 668393007 - 2² = 668393003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668393007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668393003) 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, 432688 + ... + 434229.

It is an arithmetic number, because the mean of its divisors is an integer number (111832422).

Almost surely, 2^668393007 is an apocalyptic number.

668393007 is a deficient number, since it is larger than the sum of its proper divisors (226266369).

668393007 is a wasteful number, since it uses less digits than its factorization.

668393007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867177.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 668393007 is about 25853.2977973797. The cubic root of 668393007 is about 874.3338633941. Note that the first 3 decimals are identical.

The spelling of 668393007 in words is "six hundred sixty-eight million, three hundred ninety-three thousand, seven".