685112184089 has 2 divisors, whose sum is σ = 685112184090. Its totient is φ = 685112184088.

The previous prime is 685112184067. The next prime is 685112184139. The reversal of 685112184089 is 980481211586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513898295689 + 171213888400 = 716867^2 + 413780^2 .

It is a cyclic number.

It is not a de Polignac number, because 685112184089 - 2¹⁶ = 685112118553 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 685112184089.

It is not a weakly prime, because it can be changed into another prime (685112684089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342556092044 + 342556092045.

It is an arithmetic number, because the mean of its divisors is an integer number (342556092045).

Almost surely, 2^685112184089 is an apocalyptic number.

It is an amenable number.

685112184089 is a deficient number, since it is larger than the sum of its proper divisors (1).

685112184089 is an equidigital number, since it uses as much as digits as its factorization.

685112184089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 685112184089 in words is "six hundred eighty-five billion, one hundred twelve million, one hundred eighty-four thousand, eighty-nine".