686838432991523 has 2 divisors, whose sum is σ = 686838432991524. Its totient is φ = 686838432991522.

The previous prime is 686838432991439. The next prime is 686838432991559. The reversal of 686838432991523 is 325199234838686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686838432991523 - 2²⁸ = 686838164556067 is a prime.

It is not a weakly prime, because it can be changed into another prime (686838432994523) 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, 343419216495761 + 343419216495762.

It is an arithmetic number, because the mean of its divisors is an integer number (343419216495762).

Almost surely, 2^{686838432991523} is an apocalyptic number.

686838432991523 is a deficient number, since it is larger than the sum of its proper divisors (1).

686838432991523 is an equidigital number, since it uses as much as digits as its factorization.

686838432991523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3224862720, while the sum is 77.

The spelling of 686838432991523 in words is "six hundred eighty-six trillion, eight hundred thirty-eight billion, four hundred thirty-two million, nine hundred ninety-one thousand, five hundred twenty-three".