668266 has 4 divisors (see below), whose sum is σ = 1002402. Its totient is φ = 334132.

The previous prime is 668243. The next prime is 668273. The reversal of 668266 is 662866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 342225 + 326041 = 585^2 + 571^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167065 + ... + 167068.

2⁶⁶⁸²⁶⁶ is an apocalyptic number.

668266 is a deficient number, since it is larger than the sum of its proper divisors (334136).

668266 is a wasteful number, since it uses less digits than its factorization.

668266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334135.

The product of its digits is 20736, while the sum is 34.

The square root of 668266 is about 817.4753818923. The cubic root of 668266 is about 87.4278480032.

The spelling of 668266 in words is "six hundred sixty-eight thousand, two hundred sixty-six".