68536081 has 2 divisors, whose sum is σ = 68536082. Its totient is φ = 68536080.

The previous prime is 68536079. The next prime is 68536157. The reversal of 68536081 is 18063586.

68536081 is nontrivially palindromic in base 6.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 7929856 = 7785^2 + 2816^2 .

It is a cyclic number.

It is not a de Polignac number, because 68536081 - 2¹ = 68536079 is a prime.

It is a super-2 number, since 2×68536081² = 9394388797677122, which contains 22 as substring.

Together with 68536079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68536081.

It is not a weakly prime, because it can be changed into another prime (68530081) 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, 34268040 + 34268041.

It is an arithmetic number, because the mean of its divisors is an integer number (34268041).

Almost surely, 2^68536081 is an apocalyptic number.

It is an amenable number.

68536081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68536081 is an equidigital number, since it uses as much as digits as its factorization.

68536081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 68536081 is about 8278.6521245913. The cubic root of 68536081 is about 409.2353007860.

The spelling of 68536081 in words is "sixty-eight million, five hundred thirty-six thousand, eighty-one".