668597 has 4 divisors (see below), whose sum is σ = 670560. Its totient is φ = 666636.

The previous prime is 668581. The next prime is 668599. The reversal of 668597 is 795866.

It is a happy number.

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 668597 - 2⁴ = 668581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (167640).

2⁶⁶⁸⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

668597 is a deficient number, since it is larger than the sum of its proper divisors (1963).

668597 is a wasteful number, since it uses less digits than its factorization.

668597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 90720, while the sum is 41.

The square root of 668597 is about 817.6778094091. The cubic root of 668597 is about 87.4422803007.

It can be divided in two parts, 66859 and 7, that added together give a palindrome (66866).

The spelling of 668597 in words is "six hundred sixty-eight thousand, five hundred ninety-seven".