685226350656 has 105 divisors (see below), whose sum is σ = 2031402255069. Its totient is φ = 228388916736.

The previous prime is 685226350537. The next prime is 685226350673. The reversal of 685226350656 is 656053622586.

The square root of 685226350656 is 827784.

It is a perfect power (a square), and thus also a powerful number.

685226350656 is a `hidden beast` number, since 6 + 8 + 5 + 22 + 63 + 506 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 411086145600 + 274140205056 = 641160^2 + 523584^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 59594700 + ... + 59606196.

Almost surely, 2^685226350656 is an apocalyptic number.

685226350656 is the 827784-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685226350656

685226350656 is an abundant number, since it is smaller than the sum of its proper divisors (1346175904413).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685226350656 is an frugal number, since it uses more digits than its factorization.

685226350656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23018 (or 11502 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 685226350656 in words is "six hundred eighty-five billion, two hundred twenty-six million, three hundred fifty thousand, six hundred fifty-six".