685966219758179 has 2 divisors, whose sum is σ = 685966219758180. Its totient is φ = 685966219758178.

The previous prime is 685966219758103. The next prime is 685966219758187. The reversal of 685966219758179 is 971857912669586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685966219758179 - 2²⁴ = 685966202980963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685966219758094 and 685966219758103.

It is not a weakly prime, because it can be changed into another prime (685966219758779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342983109879089 + 342983109879090.

It is an arithmetic number, because the mean of its divisors is an integer number (342983109879090).

Almost surely, 2^{685966219758179} is an apocalyptic number.

685966219758179 is a deficient number, since it is larger than the sum of its proper divisors (1).

685966219758179 is an equidigital number, since it uses as much as digits as its factorization.

685966219758179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24690355200, while the sum is 89.

The spelling of 685966219758179 in words is "six hundred eighty-five trillion, nine hundred sixty-six billion, two hundred nineteen million, seven hundred fifty-eight thousand, one hundred seventy-nine".