68188617137 has 2 divisors, whose sum is σ = 68188617138. Its totient is φ = 68188617136.

The previous prime is 68188617113. The next prime is 68188617139. The reversal of 68188617137 is 73171688186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54666648481 + 13521968656 = 233809^2 + 116284^2 .

It is a cyclic number.

It is not a de Polignac number, because 68188617137 - 2¹² = 68188613041 is a prime.

Together with 68188617139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68188617139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34094308568 + 34094308569.

It is an arithmetic number, because the mean of its divisors is an integer number (34094308569).

Almost surely, 2^68188617137 is an apocalyptic number.

It is an amenable number.

68188617137 is a deficient number, since it is larger than the sum of its proper divisors (1).

68188617137 is an equidigital number, since it uses as much as digits as its factorization.

68188617137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 56.

The spelling of 68188617137 in words is "sixty-eight billion, one hundred eighty-eight million, six hundred seventeen thousand, one hundred thirty-seven".