668471 has 2 divisors, whose sum is σ = 668472. Its totient is φ = 668470.

The previous prime is 668417. The next prime is 668509. The reversal of 668471 is 174866.

Together with previous prime (668417) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668471 - 2⁶ = 668407 is a prime.

It is a super-3 number, since 3×668471³ = 896125773557553333, which contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334235 + 334236.

It is an arithmetic number, because the mean of its divisors is an integer number (334236).

2⁶⁶⁸⁴⁷¹ is an apocalyptic number.

668471 is a deficient number, since it is larger than the sum of its proper divisors (1).

668471 is an equidigital number, since it uses as much as digits as its factorization.

668471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 668471 is about 817.6007583167. The cubic root of 668471 is about 87.4367869968.

The spelling of 668471 in words is "six hundred sixty-eight thousand, four hundred seventy-one".