68355978169 has 2 divisors, whose sum is σ = 68355978170. Its totient is φ = 68355978168.

The previous prime is 68355978157. The next prime is 68355978209. The reversal of 68355978169 is 96187955386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43113123769 + 25242854400 = 207637^2 + 158880^2 .

It is a cyclic number.

It is not a de Polignac number, because 68355978169 - 2⁵ = 68355978137 is a prime.

It is a super-2 number, since 2×68355978169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68355978269) 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 as a sum of consecutive naturals, namely, 34177989084 + 34177989085.

It is an arithmetic number, because the mean of its divisors is an integer number (34177989085).

Almost surely, 2^68355978169 is an apocalyptic number.

It is an amenable number.

68355978169 is a deficient number, since it is larger than the sum of its proper divisors (1).

68355978169 is an equidigital number, since it uses as much as digits as its factorization.

68355978169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97977600, while the sum is 67.

The spelling of 68355978169 in words is "sixty-eight billion, three hundred fifty-five million, nine hundred seventy-eight thousand, one hundred sixty-nine".