68006668242857 has 2 divisors, whose sum is σ = 68006668242858. Its totient is φ = 68006668242856.

The previous prime is 68006668242827. The next prime is 68006668242869. The reversal of 68006668242857 is 75824286660086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65188765489936 + 2817902752921 = 8073956^2 + 1678661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68006668242857 is a prime.

It is not a weakly prime, because it can be changed into another prime (68006668242827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34003334121428 + 34003334121429.

It is an arithmetic number, because the mean of its divisors is an integer number (34003334121429).

Almost surely, 2^{68006668242857} is an apocalyptic number.

It is an amenable number.

68006668242857 is a deficient number, since it is larger than the sum of its proper divisors (1).

68006668242857 is an equidigital number, since it uses as much as digits as its factorization.

68006668242857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 371589120, while the sum is 68.

The spelling of 68006668242857 in words is "sixty-eight trillion, six billion, six hundred sixty-eight million, two hundred forty-two thousand, eight hundred fifty-seven".