668836361 has 2 divisors, whose sum is σ = 668836362. Its totient is φ = 668836360.

The previous prime is 668836339. The next prime is 668836369. The reversal of 668836361 is 163638866.

It is a happy number.

668836361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 607918336 + 60918025 = 24656^2 + 7805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668836361 is a prime.

It is not a weakly prime, because it can be changed into another prime (668836369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334418180 + 334418181.

It is an arithmetic number, because the mean of its divisors is an integer number (334418181).

Almost surely, 2^668836361 is an apocalyptic number.

It is an amenable number.

668836361 is a deficient number, since it is larger than the sum of its proper divisors (1).

668836361 is an equidigital number, since it uses as much as digits as its factorization.

668836361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The square root of 668836361 is about 25861.8707946660. The cubic root of 668836361 is about 874.5271397721.

The spelling of 668836361 in words is "six hundred sixty-eight million, eight hundred thirty-six thousand, three hundred sixty-one".