668414137 has 2 divisors, whose sum is σ = 668414138. Its totient is φ = 668414136.

The previous prime is 668414107. The next prime is 668414203. The reversal of 668414137 is 731414866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664556841 + 3857296 = 25779^2 + 1964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668414137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668414137.

It is not a weakly prime, because it can be changed into another prime (668414107) 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, 334207068 + 334207069.

It is an arithmetic number, because the mean of its divisors is an integer number (334207069).

Almost surely, 2^668414137 is an apocalyptic number.

It is an amenable number.

668414137 is a deficient number, since it is larger than the sum of its proper divisors (1).

668414137 is an equidigital number, since it uses as much as digits as its factorization.

668414137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 668414137 is about 25853.7064460785. The cubic root of 668414137 is about 874.3430767759.

The spelling of 668414137 in words is "six hundred sixty-eight million, four hundred fourteen thousand, one hundred thirty-seven".