686329577 has 2 divisors, whose sum is σ = 686329578. Its totient is φ = 686329576.

The previous prime is 686329549. The next prime is 686329603. The reversal of 686329577 is 775923686.

686329577 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530104576 + 156225001 = 23024^2 + 12499^2 .

It is a cyclic number.

It is not a de Polignac number, because 686329577 - 2¹⁸ = 686067433 is a prime.

It is not a weakly prime, because it can be changed into another prime (686329517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343164788 + 343164789.

It is an arithmetic number, because the mean of its divisors is an integer number (343164789).

Almost surely, 2^686329577 is an apocalyptic number.

It is an amenable number.

686329577 is a deficient number, since it is larger than the sum of its proper divisors (1).

686329577 is an equidigital number, since it uses as much as digits as its factorization.

686329577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 53.

The square root of 686329577 is about 26197.8926060857. The cubic root of 686329577 is about 882.0859507492.

The spelling of 686329577 in words is "six hundred eighty-six million, three hundred twenty-nine thousand, five hundred seventy-seven".