668107406 has 8 divisors (see below), whose sum is σ = 1002636480. Its totient is φ = 333895248.

The previous prime is 668107403. The next prime is 668107457. The reversal of 668107406 is 604701866.

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

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 668107406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668107403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73886 + ... + 82433.

It is an arithmetic number, because the mean of its divisors is an integer number (125329560).

Almost surely, 2^668107406 is an apocalyptic number.

668107406 is a deficient number, since it is larger than the sum of its proper divisors (334529074).

668107406 is a wasteful number, since it uses less digits than its factorization.

668107406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158458.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 668107406 is about 25847.7737145774. The cubic root of 668107406 is about 874.2093128187.

The spelling of 668107406 in words is "six hundred sixty-eight million, one hundred seven thousand, four hundred six".