668260771 has 2 divisors, whose sum is σ = 668260772. Its totient is φ = 668260770.

The previous prime is 668260757. The next prime is 668260777. The reversal of 668260771 is 177062866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668260771 - 2⁵ = 668260739 is a prime.

It is equal to p_34692829 and since 668260771 and 34692829 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (668260777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334130385 + 334130386.

It is an arithmetic number, because the mean of its divisors is an integer number (334130386).

Almost surely, 2^668260771 is an apocalyptic number.

668260771 is a deficient number, since it is larger than the sum of its proper divisors (1).

668260771 is an equidigital number, since it uses as much as digits as its factorization.

668260771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 668260771 is about 25850.7402408519. The cubic root of 668260771 is about 874.2761996957.

The spelling of 668260771 in words is "six hundred sixty-eight million, two hundred sixty thousand, seven hundred seventy-one".