68319661 has 2 divisors, whose sum is σ = 68319662. Its totient is φ = 68319660.

The previous prime is 68319613. The next prime is 68319697. The reversal of 68319661 is 16691386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60372900 + 7946761 = 7770^2 + 2819^2 .

It is a cyclic number.

It is not a de Polignac number, because 68319661 - 2⁹ = 68319149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68319761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34159830 + 34159831.

It is an arithmetic number, because the mean of its divisors is an integer number (34159831).

Almost surely, 2^68319661 is an apocalyptic number.

It is an amenable number.

68319661 is a deficient number, since it is larger than the sum of its proper divisors (1).

68319661 is an equidigital number, since it uses as much as digits as its factorization.

68319661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 68319661 is about 8265.5708211835. The cubic root of 68319661 is about 408.8040919477.

The spelling of 68319661 in words is "sixty-eight million, three hundred nineteen thousand, six hundred sixty-one".