685774453225 has 81 divisors (see below), whose sum is σ = 940670713143.
Its totient is φ = 495835512480.
The previous prime is 685774453219. The next prime is 685774453249. The reversal of 685774453225 is 522354477586.
The square root of 685774453225 is 828115.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 246878803161 + 438895650064 = 496869^2 + 662492^2
It is not a de Polignac number, because 685774453225 - 25 = 685774453193 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 685774453225.
It is an unprimeable number.
It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1809431086 + ... + 1809431464.
Almost surely, 2685774453225 is an apocalyptic number.
685774453225 is the 828115-th square number.
685774453225 is the 414058-th centered octagonal number.
It is an amenable number.
685774453225 is a deficient number, since it is larger than the sum of its proper divisors (254896259918).
685774453225 is an equidigital number, since it uses as much as digits as its factorization.
685774453225 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 852 (or 426 counting only the distinct ones).
The product of its digits is 56448000, while the sum is 58.
The spelling of 685774453225 in words is "six hundred eighty-five billion, seven hundred seventy-four million, four hundred fifty-three thousand, two hundred twenty-five".