68843549657 has 2 divisors, whose sum is σ = 68843549658. Its totient is φ = 68843549656.

The previous prime is 68843549651. The next prime is 68843549681. The reversal of 68843549657 is 75694534886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49170401536 + 19673148121 = 221744^2 + 140261^2 .

It is a cyclic number.

It is not a de Polignac number, because 68843549657 - 2¹⁰ = 68843548633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68843549593 and 68843549602.

It is not a weakly prime, because it can be changed into another prime (68843549651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34421774828 + 34421774829.

It is an arithmetic number, because the mean of its divisors is an integer number (34421774829).

Almost surely, 2^68843549657 is an apocalyptic number.

It is an amenable number.

68843549657 is a deficient number, since it is larger than the sum of its proper divisors (1).

68843549657 is an equidigital number, since it uses as much as digits as its factorization.

68843549657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174182400, while the sum is 65.

The spelling of 68843549657 in words is "sixty-eight billion, eight hundred forty-three million, five hundred forty-nine thousand, six hundred fifty-seven".