668677 has 2 divisors, whose sum is σ = 668678. Its totient is φ = 668676.

The previous prime is 668671. The next prime is 668687. The reversal of 668677 is 776866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 30276 = 799^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 668677 - 2¹⁵ = 635909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334338 + 334339.

It is an arithmetic number, because the mean of its divisors is an integer number (334339).

2⁶⁶⁸⁶⁷⁷ is an apocalyptic number.

It is an amenable number.

668677 is a deficient number, since it is larger than the sum of its proper divisors (1).

668677 is an equidigital number, since it uses as much as digits as its factorization.

668677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 668677 is about 817.7267269693. The cubic root of 668677 is about 87.4457677545.

The spelling of 668677 in words is "six hundred sixty-eight thousand, six hundred seventy-seven".