668067739 has 2 divisors, whose sum is σ = 668067740. Its totient is φ = 668067738.

The previous prime is 668067733. The next prime is 668067761. The reversal of 668067739 is 937760866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668067739 - 2⁷ = 668067611 is a prime.

It is not a weakly prime, because it can be changed into another prime (668067733) 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, 334033869 + 334033870.

It is an arithmetic number, because the mean of its divisors is an integer number (334033870).

Almost surely, 2^668067739 is an apocalyptic number.

668067739 is a deficient number, since it is larger than the sum of its proper divisors (1).

668067739 is an equidigital number, since it uses as much as digits as its factorization.

668067739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 52.

The square root of 668067739 is about 25847.0063837188. The cubic root of 668067739 is about 874.1920112358.

The spelling of 668067739 in words is "six hundred sixty-eight million, sixty-seven thousand, seven hundred thirty-nine".