686748822041 has 2 divisors, whose sum is σ = 686748822042. Its totient is φ = 686748822040.

The previous prime is 686748821971. The next prime is 686748822059. The reversal of 686748822041 is 140228847686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533688691600 + 153060130441 = 730540^2 + 391229^2 .

It is a cyclic number.

It is not a de Polignac number, because 686748822041 - 2³⁰ = 685675080217 is a prime.

It is not a weakly prime, because it can be changed into another prime (686748822241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343374411020 + 343374411021.

It is an arithmetic number, because the mean of its divisors is an integer number (343374411021).

Almost surely, 2^686748822041 is an apocalyptic number.

It is an amenable number.

686748822041 is a deficient number, since it is larger than the sum of its proper divisors (1).

686748822041 is an equidigital number, since it uses as much as digits as its factorization.

686748822041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8257536, while the sum is 56.

The spelling of 686748822041 in words is "six hundred eighty-six billion, seven hundred forty-eight million, eight hundred twenty-two thousand, forty-one".