68695840161 has 24 divisors (see below), whose sum is σ = 106874487720. Its totient is φ = 42268709376.

The previous prime is 68695840159. The next prime is 68695840193. The reversal of 68695840161 is 16104859686.

It can be written as a sum of positive squares in 4 ways, for example, as 1020419136 + 67675421025 = 31944^2 + 260145^2 .

It is not a de Polignac number, because 68695840161 - 2¹ = 68695840159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68695840098 and 68695840107.

It is not an unprimeable number, because it can be changed into a prime (68695850161) 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 in 23 ways as a sum of consecutive naturals, for example, 944095 + ... + 1014251.

It is an arithmetic number, because the mean of its divisors is an integer number (4453103655).

Almost surely, 2^68695840161 is an apocalyptic number.

It is an amenable number.

68695840161 is a deficient number, since it is larger than the sum of its proper divisors (38178647559).

68695840161 is a wasteful number, since it uses less digits than its factorization.

68695840161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78545 (or 78542 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 68695840161 in words is "sixty-eight billion, six hundred ninety-five million, eight hundred forty thousand, one hundred sixty-one".