68128710581977 has 2 divisors, whose sum is σ = 68128710581978. Its totient is φ = 68128710581976.

The previous prime is 68128710581929. The next prime is 68128710582013. The reversal of 68128710581977 is 77918501782186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60417337033881 + 7711373548096 = 7772859^2 + 2776936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68128710581977 is a prime.

It is not a weakly prime, because it can be changed into another prime (68128710581927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34064355290988 + 34064355290989.

It is an arithmetic number, because the mean of its divisors is an integer number (34064355290989).

Almost surely, 2^{68128710581977} is an apocalyptic number.

It is an amenable number.

68128710581977 is a deficient number, since it is larger than the sum of its proper divisors (1).

68128710581977 is an equidigital number, since it uses as much as digits as its factorization.

68128710581977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94832640, while the sum is 70.

The spelling of 68128710581977 in words is "sixty-eight trillion, one hundred twenty-eight billion, seven hundred ten million, five hundred eighty-one thousand, nine hundred seventy-seven".