68888888881 has 2 divisors, whose sum is σ = 68888888882. Its totient is φ = 68888888880.

The previous prime is 68888888839. The next prime is 68888888891. The reversal of 68888888881 is 18888888886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64211560000 + 4677328881 = 253400^2 + 68391^2 .

It is a cyclic number.

It is not a de Polignac number, because 68888888881 - 2¹³ = 68888880689 is a prime.

It is a super-2 number, since 2×68888888881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68888888801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34444444440 + 34444444441.

It is an arithmetic number, because the mean of its divisors is an integer number (34444444441).

Almost surely, 2^68888888881 is an apocalyptic number.

It is an amenable number.

68888888881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68888888881 is an equidigital number, since it uses as much as digits as its factorization.

68888888881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 805306368, while the sum is 79.

The spelling of 68888888881 in words is "sixty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-one".