685701172193 has 2 divisors, whose sum is σ = 685701172194. Its totient is φ = 685701172192.

The previous prime is 685701172187. The next prime is 685701172229. The reversal of 685701172193 is 391271107586.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 685661834209 + 39337984 = 828047^2 + 6272^2 .

It is a cyclic number.

It is not a de Polignac number, because 685701172193 - 2¹⁸ = 685700910049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (685701172103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342850586096 + 342850586097.

It is an arithmetic number, because the mean of its divisors is an integer number (342850586097).

Almost surely, 2^685701172193 is an apocalyptic number.

It is an amenable number.

685701172193 is a deficient number, since it is larger than the sum of its proper divisors (1).

685701172193 is an equidigital number, since it uses as much as digits as its factorization.

685701172193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 685701172193 in words is "six hundred eighty-five billion, seven hundred one million, one hundred seventy-two thousand, one hundred ninety-three".