668769623 has 2 divisors, whose sum is σ = 668769624. Its totient is φ = 668769622.

The previous prime is 668769617. The next prime is 668769637. The reversal of 668769623 is 326967866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668769623 - 2⁶ = 668769559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668769683) 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, 334384811 + 334384812.

It is an arithmetic number, because the mean of its divisors is an integer number (334384812).

Almost surely, 2^668769623 is an apocalyptic number.

668769623 is a deficient number, since it is larger than the sum of its proper divisors (1).

668769623 is an equidigital number, since it uses as much as digits as its factorization.

668769623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 53.

The square root of 668769623 is about 25860.5804845908. The cubic root of 668769623 is about 874.4980513747.

The spelling of 668769623 in words is "six hundred sixty-eight million, seven hundred sixty-nine thousand, six hundred twenty-three".