686712820273 has 2 divisors, whose sum is σ = 686712820274. Its totient is φ = 686712820272.

The previous prime is 686712820193. The next prime is 686712820303. The reversal of 686712820273 is 372028217686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 569463418384 + 117249401889 = 754628^2 + 342417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686712820273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686712820273.

It is not a weakly prime, because it can be changed into another prime (686712820373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343356410136 + 343356410137.

It is an arithmetic number, because the mean of its divisors is an integer number (343356410137).

Almost surely, 2^686712820273 is an apocalyptic number.

It is an amenable number.

686712820273 is a deficient number, since it is larger than the sum of its proper divisors (1).

686712820273 is an equidigital number, since it uses as much as digits as its factorization.

686712820273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 686712820273 in words is "six hundred eighty-six billion, seven hundred twelve million, eight hundred twenty thousand, two hundred seventy-three".