68209657 has 2 divisors, whose sum is σ = 68209658. Its totient is φ = 68209656.

The previous prime is 68209633. The next prime is 68209681. The reversal of 68209657 is 75690286.

It is a balanced prime because it is at equal distance from previous prime (68209633) and next prime (68209681).

It can be written as a sum of positive squares in only one way, i.e., 59305401 + 8904256 = 7701^2 + 2984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68209657 is a prime.

It is not a weakly prime, because it can be changed into another prime (68203657) 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, 34104828 + 34104829.

It is an arithmetic number, because the mean of its divisors is an integer number (34104829).

Almost surely, 2^68209657 is an apocalyptic number.

It is an amenable number.

68209657 is a deficient number, since it is larger than the sum of its proper divisors (1).

68209657 is an equidigital number, since it uses as much as digits as its factorization.

68209657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 68209657 is about 8258.9137905659. The cubic root of 68209657 is about 408.5845639120.

The spelling of 68209657 in words is "sixty-eight million, two hundred nine thousand, six hundred fifty-seven".