685778653711 has 2 divisors, whose sum is σ = 685778653712. Its totient is φ = 685778653710.

The previous prime is 685778653663. The next prime is 685778653751. The reversal of 685778653711 is 117356877586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685778653711 - 2⁹ = 685778653199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685778653751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342889326855 + 342889326856.

It is an arithmetic number, because the mean of its divisors is an integer number (342889326856).

Almost surely, 2^685778653711 is an apocalyptic number.

685778653711 is a deficient number, since it is larger than the sum of its proper divisors (1).

685778653711 is an equidigital number, since it uses as much as digits as its factorization.

685778653711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59270400, while the sum is 64.

The spelling of 685778653711 in words is "six hundred eighty-five billion, seven hundred seventy-eight million, six hundred fifty-three thousand, seven hundred eleven".