668049841 has 2 divisors, whose sum is σ = 668049842. Its totient is φ = 668049840.

The previous prime is 668049839. The next prime is 668049883. The reversal of 668049841 is 148940866.

668049841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645922225 + 22127616 = 25415^2 + 4704^2 .

It is a cyclic number.

It is not a de Polignac number, because 668049841 - 2¹ = 668049839 is a prime.

Together with 668049839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 668049791 and 668049800.

It is not a weakly prime, because it can be changed into another prime (668041841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334024920 + 334024921.

It is an arithmetic number, because the mean of its divisors is an integer number (334024921).

Almost surely, 2^668049841 is an apocalyptic number.

It is an amenable number.

668049841 is a deficient number, since it is larger than the sum of its proper divisors (1).

668049841 is an equidigital number, since it uses as much as digits as its factorization.

668049841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 668049841 is about 25846.6601517488. The cubic root of 668049841 is about 874.1842044284.

The spelling of 668049841 in words is "six hundred sixty-eight million, forty-nine thousand, eight hundred forty-one".