668613 has 8 divisors (see below), whose sum is σ = 972576. Its totient is φ = 405200.

The previous prime is 668611. The next prime is 668617. The reversal of 668613 is 316866.

668613 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 668613 - 2¹ = 668611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668611) 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, 10098 + ... + 10163.

It is an arithmetic number, because the mean of its divisors is an integer number (121572).

2⁶⁶⁸⁶¹³ is an apocalyptic number.

It is an amenable number.

668613 is a deficient number, since it is larger than the sum of its proper divisors (303963).

668613 is a wasteful number, since it uses less digits than its factorization.

668613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20275.

The product of its digits is 5184, while the sum is 30.

The square root of 668613 is about 817.6875931552. The cubic root of 668613 is about 87.4429778137.

The spelling of 668613 in words is "six hundred sixty-eight thousand, six hundred thirteen".