68161311765 has 12 divisors (see below), whose sum is σ = 118146273804. Its totient is φ = 36352699584.

The previous prime is 68161311763. The next prime is 68161311833. The reversal of 68161311765 is 56711316186.

It can be written as a sum of positive squares in 2 ways, for example, as 29181522276 + 38979789489 = 170826^2 + 197433^2 .

It is not a de Polignac number, because 68161311765 - 2¹ = 68161311763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1514695817 = 68161311765 / (6 + 8 + 1 + 6 + 1 + 3 + 1 + 1 + 7 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68161311765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68161311763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 757347864 + ... + 757347953.

It is an arithmetic number, because the mean of its divisors is an integer number (9845522817).

Almost surely, 2^68161311765 is an apocalyptic number.

It is an amenable number.

68161311765 is a deficient number, since it is larger than the sum of its proper divisors (49984962039).

68161311765 is a wasteful number, since it uses less digits than its factorization.

68161311765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514695828 (or 1514695825 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 68161311765 in words is "sixty-eight billion, one hundred sixty-one million, three hundred eleven thousand, seven hundred sixty-five".