68705056909 has 2 divisors, whose sum is σ = 68705056910. Its totient is φ = 68705056908.

The previous prime is 68705056891. The next prime is 68705056919. The reversal of 68705056909 is 90965050786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40050015625 + 28655041284 = 200125^2 + 169278^2 .

It is a cyclic number.

It is not a de Polignac number, because 68705056909 - 2²¹ = 68702959757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68705056909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68705056919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34352528454 + 34352528455.

It is an arithmetic number, because the mean of its divisors is an integer number (34352528455).

Almost surely, 2^68705056909 is an apocalyptic number.

It is an amenable number.

68705056909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68705056909 is an equidigital number, since it uses as much as digits as its factorization.

68705056909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 68705056909 in words is "sixty-eight billion, seven hundred five million, fifty-six thousand, nine hundred nine".