668801 has 6 divisors (see below), whose sum is σ = 778050. Its totient is φ = 573216.

The previous prime is 668791. The next prime is 668803. The reversal of 668801 is 108866.

It can be written as a sum of positive squares in only one way, i.e., 442225 + 226576 = 665^2 + 476^2 .

It is not a de Polignac number, because 668801 - 2⁶ = 668737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6776 + ... + 6873.

It is an arithmetic number, because the mean of its divisors is an integer number (129675).

2⁶⁶⁸⁸⁰¹ is an apocalyptic number.

It is an amenable number.

668801 is a deficient number, since it is larger than the sum of its proper divisors (109249).

668801 is a wasteful number, since it uses less digits than its factorization.

668801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13663 (or 13656 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 668801 is about 817.8025434052. The cubic root of 668801 is about 87.4511727582.

The spelling of 668801 in words is "six hundred sixty-eight thousand, eight hundred one".