68111110981 has 2 divisors, whose sum is σ = 68111110982. Its totient is φ = 68111110980.

The previous prime is 68111110961. The next prime is 68111111021. The reversal of 68111110981 is 18901111186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57908090881 + 10203020100 = 240641^2 + 101010^2 .

It is a cyclic number.

It is not a de Polignac number, because 68111110981 - 2⁷ = 68111110853 is a prime.

It is a super-2 number, since 2×68111110981² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68111110981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68111110901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34055555490 + 34055555491.

It is an arithmetic number, because the mean of its divisors is an integer number (34055555491).

Almost surely, 2^68111110981 is an apocalyptic number.

It is an amenable number.

68111110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

68111110981 is an equidigital number, since it uses as much as digits as its factorization.

68111110981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 37.

The spelling of 68111110981 in words is "sixty-eight billion, one hundred eleven million, one hundred ten thousand, nine hundred eighty-one".