68400081109 has 2 divisors, whose sum is σ = 68400081110. Its totient is φ = 68400081108.

The previous prime is 68400081107. The next prime is 68400081119. The reversal of 68400081109 is 90118000486.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61518880900 + 6881200209 = 248030^2 + 82953^2 .

It is a cyclic number.

It is not a de Polignac number, because 68400081109 - 2¹ = 68400081107 is a prime.

Together with 68400081107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68400081107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34200040554 + 34200040555.

It is an arithmetic number, because the mean of its divisors is an integer number (34200040555).

Almost surely, 2^68400081109 is an apocalyptic number.

It is an amenable number.

68400081109 is a deficient number, since it is larger than the sum of its proper divisors (1).

68400081109 is an equidigital number, since it uses as much as digits as its factorization.

68400081109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 68400081109 in words is "sixty-eight billion, four hundred million, eighty-one thousand, one hundred nine".