68988666881 has 2 divisors, whose sum is σ = 68988666882. Its totient is φ = 68988666880.

The previous prime is 68988666869. The next prime is 68988666883. The reversal of 68988666881 is 18866688986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56758297600 + 12230369281 = 238240^2 + 110591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68988666881 is a prime.

It is a super-2 number, since 2×68988666881² (a number of 22 digits) contains 22 as substring.

Together with 68988666883, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68988666799 and 68988666808.

It is not a weakly prime, because it can be changed into another prime (68988666883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34494333440 + 34494333441.

It is an arithmetic number, because the mean of its divisors is an integer number (34494333441).

Almost surely, 2^68988666881 is an apocalyptic number.

It is an amenable number.

68988666881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68988666881 is an equidigital number, since it uses as much as digits as its factorization.

68988666881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 382205952, while the sum is 74.

The spelling of 68988666881 in words is "sixty-eight billion, nine hundred eighty-eight million, six hundred sixty-six thousand, eight hundred eighty-one".