668261 has 8 divisors (see below), whose sum is σ = 739200. Its totient is φ = 599040.

The previous prime is 668243. The next prime is 668273. The reversal of 668261 is 162866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668261 - 2¹⁴ = 651877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (92400).

2⁶⁶⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

668261 is a deficient number, since it is larger than the sum of its proper divisors (70939).

668261 is a wasteful number, since it uses less digits than its factorization.

668261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 3456, while the sum is 29.

The square root of 668261 is about 817.4723236905. The cubic root of 668261 is about 87.4276299562.

It can be divided in two parts, 668 and 261, that added together give a palindrome (929).

The spelling of 668261 in words is "six hundred sixty-eight thousand, two hundred sixty-one".