668065 has 8 divisors (see below), whose sum is σ = 817128. Its totient is φ = 524160.

The previous prime is 668051. The next prime is 668069. The reversal of 668065 is 560866.

It can be written as a sum of positive squares in 4 ways, for example, as 2209 + 665856 = 47^2 + 816^2 .

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

It is not a de Polignac number, because 668065 - 2⁵ = 668033 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (668069) 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, 996 + ... + 1525.

It is an arithmetic number, because the mean of its divisors is an integer number (102141).

2⁶⁶⁸⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

668065 is a deficient number, since it is larger than the sum of its proper divisors (149063).

668065 is a wasteful number, since it uses less digits than its factorization.

668065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 668065 is about 817.3524331645. The cubic root of 668065 is about 87.4190816539.

The spelling of 668065 in words is "six hundred sixty-eight thousand, sixty-five".