686119809389 has 4 divisors (see below), whose sum is σ = 784136925024. Its totient is φ = 588102693756.

The previous prime is 686119809373. The next prime is 686119809509. The reversal of 686119809389 is 983908911686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983908911686 = 2 ⋅491954455843.

It is a cyclic number.

It is not a de Polignac number, because 686119809389 - 2⁴ = 686119809373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686119800389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49008557807 + ... + 49008557820.

It is an arithmetic number, because the mean of its divisors is an integer number (196034231256).

Almost surely, 2^686119809389 is an apocalyptic number.

It is an amenable number.

686119809389 is a deficient number, since it is larger than the sum of its proper divisors (98017115635).

686119809389 is an equidigital number, since it uses as much as digits as its factorization.

686119809389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98017115634.

The product of its (nonzero) digits is 40310784, while the sum is 68.

The spelling of 686119809389 in words is "six hundred eighty-six billion, one hundred nineteen million, eight hundred nine thousand, three hundred eighty-nine".