685221789056 has 48 divisors (see below), whose sum is σ = 1587962180340. Its totient is φ = 293666478336.

The previous prime is 685221789041. The next prime is 685221789067. The reversal of 685221789056 is 650987122586.

685221789056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×685221789056² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 685221788986 and 685221789004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54619190 + ... + 54631733.

Almost surely, 2^685221789056 is an apocalyptic number.

It is an amenable number.

685221789056 is an abundant number, since it is smaller than the sum of its proper divisors (902740391284).

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

685221789056 is a wasteful number, since it uses less digits than its factorization.

685221789056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109250951 (or 109250932 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 685221789056 in words is "six hundred eighty-five billion, two hundred twenty-one million, seven hundred eighty-nine thousand, fifty-six".