68008081 has 2 divisors, whose sum is σ = 68008082. Its totient is φ = 68008080.

The previous prime is 68008037. The next prime is 68008091. The reversal of 68008081 is 18080086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66977856 + 1030225 = 8184^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 68008081 - 2¹³ = 67999889 is a prime.

It is a super-2 number, since 2×68008081² = 9250198162605122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68008021) 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, 34004040 + 34004041.

It is an arithmetic number, because the mean of its divisors is an integer number (34004041).

Almost surely, 2^68008081 is an apocalyptic number.

It is an amenable number.

68008081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68008081 is an equidigital number, since it uses as much as digits as its factorization.

68008081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 68008081 is about 8246.7012192755. The cubic root of 68008081 is about 408.1816781076.

The spelling of 68008081 in words is "sixty-eight million, eight thousand, eighty-one".