668512759 has 2 divisors, whose sum is σ = 668512760. Its totient is φ = 668512758.

The previous prime is 668512729. The next prime is 668512771. The reversal of 668512759 is 957215866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668512759 - 2¹⁷ = 668381687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668512729) 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, 334256379 + 334256380.

It is an arithmetic number, because the mean of its divisors is an integer number (334256380).

Almost surely, 2^668512759 is an apocalyptic number.

668512759 is a deficient number, since it is larger than the sum of its proper divisors (1).

668512759 is an equidigital number, since it uses as much as digits as its factorization.

668512759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 49.

The square root of 668512759 is about 25855.6136844593. The cubic root of 668512759 is about 874.3860766755.

The spelling of 668512759 in words is "six hundred sixty-eight million, five hundred twelve thousand, seven hundred fifty-nine".