668366 has 4 divisors (see below), whose sum is σ = 1002552. Its totient is φ = 334182.

The previous prime is 668347. The next prime is 668407. The reversal of 668366 is 663866.

668366 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.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668366.

It is an unprimeable number.

668366 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167090 + ... + 167093.

It is an arithmetic number, because the mean of its divisors is an integer number (250638).

2⁶⁶⁸³⁶⁶ is an apocalyptic number.

668366 is a deficient number, since it is larger than the sum of its proper divisors (334186).

668366 is a wasteful number, since it uses less digits than its factorization.

668366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334185.

The product of its digits is 31104, while the sum is 35.

The square root of 668366 is about 817.5365435257. The cubic root of 668366 is about 87.4322087162.

The spelling of 668366 in words is "six hundred sixty-eight thousand, three hundred sixty-six".