685782107522 has 6 divisors (see below), whose sum is σ = 1028674917993. Its totient is φ = 342890468192.

The previous prime is 685782107519. The next prime is 685782107567. The reversal of 685782107522 is 225701287586.

685782107522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 675813882241 + 9968225281 = 822079^2 + 99841^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=585569.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 878354 + ... + 1463922.

Almost surely, 2^685782107522 is an apocalyptic number.

685782107522 is a deficient number, since it is larger than the sum of its proper divisors (342892810471).

685782107522 is an frugal number, since it uses more digits than its factorization.

685782107522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171140 (or 585571 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 685782107522 in words is "six hundred eighty-five billion, seven hundred eighty-two million, one hundred seven thousand, five hundred twenty-two".