68556689 has 2 divisors, whose sum is σ = 68556690. Its totient is φ = 68556688.

The previous prime is 68556647. The next prime is 68556707. The reversal of 68556689 is 98665586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67782289 + 774400 = 8233^2 + 880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68556689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68556689.

It is not a weakly prime, because it can be changed into another prime (68552689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34278344 + 34278345.

It is an arithmetic number, because the mean of its divisors is an integer number (34278345).

Almost surely, 2^68556689 is an apocalyptic number.

It is an amenable number.

68556689 is a deficient number, since it is larger than the sum of its proper divisors (1).

68556689 is an equidigital number, since it uses as much as digits as its factorization.

68556689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3110400, while the sum is 53.

The square root of 68556689 is about 8279.8966780993. The cubic root of 68556689 is about 409.2763141024.

The spelling of 68556689 in words is "sixty-eight million, five hundred fifty-six thousand, six hundred eighty-nine".