68381388577 has 2 divisors, whose sum is σ = 68381388578. Its totient is φ = 68381388576.

The previous prime is 68381388541. The next prime is 68381388583. The reversal of 68381388577 is 77588318386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46536844176 + 21844544401 = 215724^2 + 147799^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68381388577 is a prime.

It is not a weakly prime, because it can be changed into another prime (68381382577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34190694288 + 34190694289.

It is an arithmetic number, because the mean of its divisors is an integer number (34190694289).

Almost surely, 2^68381388577 is an apocalyptic number.

It is an amenable number.

68381388577 is a deficient number, since it is larger than the sum of its proper divisors (1).

68381388577 is an equidigital number, since it uses as much as digits as its factorization.

68381388577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54190080, while the sum is 64.

The spelling of 68381388577 in words is "sixty-eight billion, three hundred eighty-one million, three hundred eighty-eight thousand, five hundred seventy-seven".