668995 has 8 divisors (see below), whose sum is σ = 815184. Its totient is φ = 526944.

The previous prime is 668989. The next prime is 668999. The reversal of 668995 is 599866.

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

It is a cyclic number.

It is not a de Polignac number, because 668995 - 2⁵ = 668963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668999) 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, 664 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (101898).

2⁶⁶⁸⁹⁹⁵ is an apocalyptic number.

668995 is a deficient number, since it is larger than the sum of its proper divisors (146189).

668995 is a wasteful number, since it uses less digits than its factorization.

668995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069.

The product of its digits is 116640, while the sum is 43.

The square root of 668995 is about 817.9211453435. The cubic root of 668995 is about 87.4596276336.

The spelling of 668995 in words is "six hundred sixty-eight thousand, nine hundred ninety-five".