68721770234881 has 2 divisors, whose sum is σ = 68721770234882. Its totient is φ = 68721770234880.

The previous prime is 68721770234867. The next prime is 68721770234941. The reversal of 68721770234881 is 18843207712786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68718545812225 + 3224422656 = 8289665^2 + 56784^2 .

It is a cyclic number.

It is not a de Polignac number, because 68721770234881 - 2¹¹ = 68721770232833 is a prime.

It is a super-2 number, since 2×68721770234881² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68721770334881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360885117440 + 34360885117441.

It is an arithmetic number, because the mean of its divisors is an integer number (34360885117441).

Almost surely, 2^{68721770234881} is an apocalyptic number.

It is an amenable number.

68721770234881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68721770234881 is an equidigital number, since it uses as much as digits as its factorization.

68721770234881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50577408, while the sum is 64.

The spelling of 68721770234881 in words is "sixty-eight trillion, seven hundred twenty-one billion, seven hundred seventy million, two hundred thirty-four thousand, eight hundred eighty-one".