686795779 has 2 divisors, whose sum is σ = 686795780. Its totient is φ = 686795778.

The previous prime is 686795737. The next prime is 686795821. The reversal of 686795779 is 977597686.

686795779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (686795737) and next prime (686795821).

It is a cyclic number.

It is not a de Polignac number, because 686795779 - 2⁹ = 686795267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686795779.

It is not a weakly prime, because it can be changed into another prime (686790779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343397889 + 343397890.

It is an arithmetic number, because the mean of its divisors is an integer number (343397890).

Almost surely, 2^686795779 is an apocalyptic number.

686795779 is a deficient number, since it is larger than the sum of its proper divisors (1).

686795779 is an equidigital number, since it uses as much as digits as its factorization.

686795779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40007520, while the sum is 64.

The square root of 686795779 is about 26206.7887960353. The cubic root of 686795779 is about 882.2856299177.

The spelling of 686795779 in words is "six hundred eighty-six million, seven hundred ninety-five thousand, seven hundred seventy-nine".