668145 has 8 divisors (see below), whose sum is σ = 1069056. Its totient is φ = 356336.

The previous prime is 668141. The next prime is 668153. The reversal of 668145 is 541866.

668145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 668145 - 2² = 668141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668141) 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, 22257 + ... + 22286.

It is an arithmetic number, because the mean of its divisors is an integer number (133632).

2⁶⁶⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

668145 is a deficient number, since it is larger than the sum of its proper divisors (400911).

668145 is a wasteful number, since it uses less digits than its factorization.

668145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44551.

The product of its digits is 5760, while the sum is 30.

The square root of 668145 is about 817.4013701970. The cubic root of 668145 is about 87.4225709588.

The spelling of 668145 in words is "six hundred sixty-eight thousand, one hundred forty-five".