686139727099 has 2 divisors, whose sum is σ = 686139727100. Its totient is φ = 686139727098.

The previous prime is 686139727093. The next prime is 686139727121. The reversal of 686139727099 is 990727931686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686139727099 - 2¹⁹ = 686139202811 is a prime.

It is not a weakly prime, because it can be changed into another prime (686139727093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343069863549 + 343069863550.

It is an arithmetic number, because the mean of its divisors is an integer number (343069863550).

Almost surely, 2^686139727099 is an apocalyptic number.

686139727099 is a deficient number, since it is larger than the sum of its proper divisors (1).

686139727099 is an equidigital number, since it uses as much as digits as its factorization.

686139727099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61725888, while the sum is 67.

The spelling of 686139727099 in words is "six hundred eighty-six billion, one hundred thirty-nine million, seven hundred twenty-seven thousand, ninety-nine".