685950682657 has 2 divisors, whose sum is σ = 685950682658. Its totient is φ = 685950682656.

The previous prime is 685950682609. The next prime is 685950682723. The reversal of 685950682657 is 756286059586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614474125456 + 71476557201 = 783884^2 + 267351^2 .

It is a cyclic number.

It is not a de Polignac number, because 685950682657 - 2³⁹ = 136194868769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685950682592 and 685950682601.

It is not a weakly prime, because it can be changed into another prime (685950682457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342975341328 + 342975341329.

It is an arithmetic number, because the mean of its divisors is an integer number (342975341329).

Almost surely, 2^685950682657 is an apocalyptic number.

It is an amenable number.

685950682657 is a deficient number, since it is larger than the sum of its proper divisors (1).

685950682657 is an equidigital number, since it uses as much as digits as its factorization.

685950682657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728000, while the sum is 67.

The spelling of 685950682657 in words is "six hundred eighty-five billion, nine hundred fifty million, six hundred eighty-two thousand, six hundred fifty-seven".