668265079 has 2 divisors, whose sum is σ = 668265080. Its totient is φ = 668265078.

The previous prime is 668265077. The next prime is 668265119. The reversal of 668265079 is 970562866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668265079 - 2¹ = 668265077 is a prime.

Together with 668265077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668265071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334132539 + 334132540.

It is an arithmetic number, because the mean of its divisors is an integer number (334132540).

Almost surely, 2^668265079 is an apocalyptic number.

668265079 is a deficient number, since it is larger than the sum of its proper divisors (1).

668265079 is an equidigital number, since it uses as much as digits as its factorization.

668265079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 668265079 is about 25850.8235652174. The cubic root of 668265079 is about 874.2780783904.

The spelling of 668265079 in words is "six hundred sixty-eight million, two hundred sixty-five thousand, seventy-nine".