668411 has 4 divisors (see below), whose sum is σ = 679800. Its totient is φ = 657024.

The previous prime is 668407. The next prime is 668417. The reversal of 668411 is 114866.

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

It is not a de Polignac number, because 668411 - 2² = 668407 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (668417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5606 + ... + 5723.

It is an arithmetic number, because the mean of its divisors is an integer number (169950).

2⁶⁶⁸⁴¹¹ is an apocalyptic number.

668411 is a deficient number, since it is larger than the sum of its proper divisors (11389).

668411 is a wasteful number, since it uses less digits than its factorization.

668411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11388.

The product of its digits is 1152, while the sum is 26.

The square root of 668411 is about 817.5640647680. The cubic root of 668411 is about 87.4341708952.

The spelling of 668411 in words is "six hundred sixty-eight thousand, four hundred eleven".