68136556769 has 4 divisors (see below), whose sum is σ = 68150903040. Its totient is φ = 68122210500.

The previous prime is 68136556759. The next prime is 68136556867. The reversal of 68136556769 is 96765563186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96765563186 = 2 ⋅48382781593.

It is a cyclic number.

It is not a de Polignac number, because 68136556769 - 2⁴ = 68136556753 is a prime.

It is a super-2 number, since 2×68136556769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68136556759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7166009 + ... + 7175510.

It is an arithmetic number, because the mean of its divisors is an integer number (17037725760).

Almost surely, 2^68136556769 is an apocalyptic number.

It is an amenable number.

68136556769 is a deficient number, since it is larger than the sum of its proper divisors (14346271).

68136556769 is a wasteful number, since it uses less digits than its factorization.

68136556769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14346270.

The product of its digits is 48988800, while the sum is 62.

The spelling of 68136556769 in words is "sixty-eight billion, one hundred thirty-six million, five hundred fifty-six thousand, seven hundred sixty-nine".