686526316369 has 2 divisors, whose sum is σ = 686526316370. Its totient is φ = 686526316368.

The previous prime is 686526316339. The next prime is 686526316373. The reversal of 686526316369 is 963613625686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686470246225 + 56070144 = 828535^2 + 7488^2 .

It is a cyclic number.

It is not a de Polignac number, because 686526316369 - 2⁷ = 686526316241 is a prime.

It is a super-2 number, since 2×686526316369² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686526316339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343263158184 + 343263158185.

It is an arithmetic number, because the mean of its divisors is an integer number (343263158185).

Almost surely, 2^686526316369 is an apocalyptic number.

It is an amenable number.

686526316369 is a deficient number, since it is larger than the sum of its proper divisors (1).

686526316369 is an equidigital number, since it uses as much as digits as its factorization.

686526316369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 61.

The spelling of 686526316369 in words is "six hundred eighty-six billion, five hundred twenty-six million, three hundred sixteen thousand, three hundred sixty-nine".