668501 has 4 divisors (see below), whose sum is σ = 672672. Its totient is φ = 664332.

The previous prime is 668471. The next prime is 668509. The reversal of 668501 is 105866.

668501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668501 - 2¹⁰ = 667477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (168168).

2⁶⁶⁸⁵⁰¹ is an apocalyptic number.

It is an amenable number.

668501 is a deficient number, since it is larger than the sum of its proper divisors (4171).

668501 is a wasteful number, since it uses less digits than its factorization.

668501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 668501 is about 817.6191044735. The cubic root of 668501 is about 87.4380949889.

The spelling of 668501 in words is "six hundred sixty-eight thousand, five hundred one".