685379467679 has 2 divisors, whose sum is σ = 685379467680. Its totient is φ = 685379467678.

The previous prime is 685379467649. The next prime is 685379467741. The reversal of 685379467679 is 976764973586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685379467679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685379467649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342689733839 + 342689733840.

It is an arithmetic number, because the mean of its divisors is an integer number (342689733840).

Almost surely, 2^685379467679 is an apocalyptic number.

685379467679 is a deficient number, since it is larger than the sum of its proper divisors (1).

685379467679 is an equidigital number, since it uses as much as digits as its factorization.

685379467679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880541440, while the sum is 77.

The spelling of 685379467679 in words is "six hundred eighty-five billion, three hundred seventy-nine million, four hundred sixty-seven thousand, six hundred seventy-nine".