668753 has 4 divisors (see below), whose sum is σ = 677988. Its totient is φ = 659520.

The previous prime is 668747. The next prime is 668761. The reversal of 668753 is 357866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 357866 = 2 ⋅178933.

It can be written as a sum of positive squares in 2 ways, for example, as 300304 + 368449 = 548^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 668753 - 2⁴ = 668737 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 (668713) 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, 4508 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (169497).

2⁶⁶⁸⁷⁵³ is an apocalyptic number.

It is an amenable number.

668753 is a deficient number, since it is larger than the sum of its proper divisors (9235).

668753 is an equidigital number, since it uses as much as digits as its factorization.

668753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9234.

The product of its digits is 30240, while the sum is 35.

The square root of 668753 is about 817.7731959413. The cubic root of 668753 is about 87.4490805780.

The spelling of 668753 in words is "six hundred sixty-eight thousand, seven hundred fifty-three".