668797 has 4 divisors (see below), whose sum is σ = 708156. Its totient is φ = 629440.

The previous prime is 668791. The next prime is 668803. The reversal of 668797 is 797866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797866 = 2 ⋅398933.

It is an interprime number because it is at equal distance from previous prime (668791) and next prime (668803).

It can be written as a sum of positive squares in 2 ways, for example, as 241081 + 427716 = 491^2 + 654^2 .

It is a cyclic number.

It is not a de Polignac number, because 668797 - 2¹¹ = 666749 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 (668791) 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, 19654 + ... + 19687.

It is an arithmetic number, because the mean of its divisors is an integer number (177039).

2⁶⁶⁸⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

668797 is a deficient number, since it is larger than the sum of its proper divisors (39359).

668797 is a wasteful number, since it uses less digits than its factorization.

668797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39358.

The product of its digits is 127008, while the sum is 43.

The square root of 668797 is about 817.8000978234. The cubic root of 668797 is about 87.4509984137.

The spelling of 668797 in words is "six hundred sixty-eight thousand, seven hundred ninety-seven".