685701172229 has 2 divisors, whose sum is σ = 685701172230. Its totient is φ = 685701172228.

The previous prime is 685701172193. The next prime is 685701172231. The reversal of 685701172229 is 922271107586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609957876004 + 75743296225 = 780998^2 + 275215^2 .

It is a cyclic number.

It is not a de Polignac number, because 685701172229 - 2¹² = 685701168133 is a prime.

Together with 685701172231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685701172529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342850586114 + 342850586115.

It is an arithmetic number, because the mean of its divisors is an integer number (342850586115).

Almost surely, 2^685701172229 is an apocalyptic number.

It is an amenable number.

685701172229 is a deficient number, since it is larger than the sum of its proper divisors (1).

685701172229 is an equidigital number, since it uses as much as digits as its factorization.

685701172229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 685701172229 in words is "six hundred eighty-five billion, seven hundred one million, one hundred seventy-two thousand, two hundred twenty-nine".