685758857573 has 2 divisors, whose sum is σ = 685758857574. Its totient is φ = 685758857572.

The previous prime is 685758857551. The next prime is 685758857591. The reversal of 685758857573 is 375758857586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628725298084 + 57033559489 = 792922^2 + 238817^2 .

It is a cyclic number.

It is not a de Polignac number, because 685758857573 - 2¹² = 685758853477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 685758857573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685758857473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342879428786 + 342879428787.

It is an arithmetic number, because the mean of its divisors is an integer number (342879428787).

Almost surely, 2^685758857573 is an apocalyptic number.

It is an amenable number.

685758857573 is a deficient number, since it is larger than the sum of its proper divisors (1).

685758857573 is an equidigital number, since it uses as much as digits as its factorization.

685758857573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680000, while the sum is 74.

The spelling of 685758857573 in words is "six hundred eighty-five billion, seven hundred fifty-eight million, eight hundred fifty-seven thousand, five hundred seventy-three".