668965 has 8 divisors (see below), whose sum is σ = 875808. Its totient is φ = 486480.

The previous prime is 668963. The next prime is 668989. The reversal of 668965 is 569866.

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

It is not a de Polignac number, because 668965 - 2¹ = 668963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668963) 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, 6027 + ... + 6136.

It is an arithmetic number, because the mean of its divisors is an integer number (109476).

2⁶⁶⁸⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

668965 is a deficient number, since it is larger than the sum of its proper divisors (206843).

668965 is a wasteful number, since it uses less digits than its factorization.

668965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12179.

The product of its digits is 77760, while the sum is 40.

The square root of 668965 is about 817.9028059617. The cubic root of 668965 is about 87.4583202855.

Subtracting from 668965 its reverse (569866), we obtain a palindrome (99099).

The spelling of 668965 in words is "six hundred sixty-eight thousand, nine hundred sixty-five".