668081 has 8 divisors (see below), whose sum is σ = 720384. Its totient is φ = 617760.

The previous prime is 668069. The next prime is 668089. The reversal of 668081 is 180866.

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 668081 - 2¹⁴ = 651697 is a prime.

It is a super-2 number, since 2×668081² = 892664445122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668081.

It is not an unprimeable number, because it can be changed into a prime (668089) 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, 245 + ... + 1181.

It is an arithmetic number, because the mean of its divisors is an integer number (90048).

2⁶⁶⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

668081 is a deficient number, since it is larger than the sum of its proper divisors (52303).

668081 is a wasteful number, since it uses less digits than its factorization.

668081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

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

The square root of 668081 is about 817.3622208054. The cubic root of 668081 is about 87.4197795372.

The spelling of 668081 in words is "six hundred sixty-eight thousand, eighty-one".