668355 has 16 divisors (see below), whose sum is σ = 1132704. Its totient is φ = 335360.

The previous prime is 668347. The next prime is 668407. The reversal of 668355 is 553866.

It is not a de Polignac number, because 668355 - 2³ = 668347 is a prime.

It is a d-powerful number, because it can be written as 6⁵ + 6⁵ + 3² + 8⁶ + 5² + 5⁸ .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056 + ... + 1565.

It is an arithmetic number, because the mean of its divisors is an integer number (70794).

2⁶⁶⁸³⁵⁵ is an apocalyptic number.

668355 is a deficient number, since it is larger than the sum of its proper divisors (464349).

668355 is a wasteful number, since it uses less digits than its factorization.

668355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646.

The product of its digits is 21600, while the sum is 33.

The square root of 668355 is about 817.5298159700. The cubic root of 668355 is about 87.4317290591.

Adding to 668355 its reverse (553866), we get a palindrome (1222221).

The spelling of 668355 in words is "six hundred sixty-eight thousand, three hundred fifty-five".