668311 has 12 divisors (see below), whose sum is σ = 812592. Its totient is φ = 547008.

The previous prime is 668303. The next prime is 668347. The reversal of 668311 is 113866.

668311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668311 - 2³ = 668303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 831 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (67716).

2⁶⁶⁸³¹¹ is an apocalyptic number.

668311 is a deficient number, since it is larger than the sum of its proper divisors (144281).

668311 is a wasteful number, since it uses less digits than its factorization.

668311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 623 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 668311 is about 817.5029051936. The cubic root of 668311 is about 87.4298103779.

It can be divided in two parts, 668 and 311, that added together give a palindrome (979).

The spelling of 668311 in words is "six hundred sixty-eight thousand, three hundred eleven".