668611 has 2 divisors, whose sum is σ = 668612. Its totient is φ = 668610.

The previous prime is 668609. The next prime is 668617. The reversal of 668611 is 116866.

668611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668611 - 2¹ = 668609 is a prime.

Together with 668609, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 668611.

It is not a weakly prime, because it can be changed into another prime (668617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334305 + 334306.

It is an arithmetic number, because the mean of its divisors is an integer number (334306).

2⁶⁶⁸⁶¹¹ is an apocalyptic number.

668611 is a deficient number, since it is larger than the sum of its proper divisors (1).

668611 is an equidigital number, since it uses as much as digits as its factorization.

668611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 668611 is about 817.6863701934. The cubic root of 668611 is about 87.4428906252.

The spelling of 668611 in words is "six hundred sixty-eight thousand, six hundred eleven".