686172212393 has 2 divisors, whose sum is σ = 686172212394. Its totient is φ = 686172212392.

The previous prime is 686172212339. The next prime is 686172212431. The reversal of 686172212393 is 393212271686.

Together with previous prime (686172212339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629401049104 + 56771163289 = 793348^2 + 238267^2 .

It is a cyclic number.

It is not a de Polignac number, because 686172212393 - 2¹⁴ = 686172196009 is a prime.

It is not a weakly prime, because it can be changed into another prime (686172212293) 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, 343086106196 + 343086106197.

It is an arithmetic number, because the mean of its divisors is an integer number (343086106197).

Almost surely, 2^686172212393 is an apocalyptic number.

It is an amenable number.

686172212393 is a deficient number, since it is larger than the sum of its proper divisors (1).

686172212393 is an equidigital number, since it uses as much as digits as its factorization.

686172212393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 50.

The spelling of 686172212393 in words is "six hundred eighty-six billion, one hundred seventy-two million, two hundred twelve thousand, three hundred ninety-three".