668581741 has 2 divisors, whose sum is σ = 668581742. Its totient is φ = 668581740.

The previous prime is 668581703. The next prime is 668581751. The reversal of 668581741 is 147185866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607819716 + 60762025 = 24654^2 + 7795^2 .

It is a cyclic number.

It is not a de Polignac number, because 668581741 - 2¹¹ = 668579693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668581691 and 668581700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668581751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334290870 + 334290871.

It is an arithmetic number, because the mean of its divisors is an integer number (334290871).

Almost surely, 2^668581741 is an apocalyptic number.

It is an amenable number.

668581741 is a deficient number, since it is larger than the sum of its proper divisors (1).

668581741 is an equidigital number, since it uses as much as digits as its factorization.

668581741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 668581741 is about 25856.9476350168. The cubic root of 668581741 is about 874.4161508090.

The spelling of 668581741 in words is "six hundred sixty-eight million, five hundred eighty-one thousand, seven hundred forty-one".