685901898864 has 960 divisors, whose sum is σ = 2595115152000. Its totient is φ = 171674173440.

The previous prime is 685901898863. The next prime is 685901898919. The reversal of 685901898864 is 468898109586.

685901898864 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-3 number, since 3×685901898864³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 685901898792 and 685901898801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685901898863) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 486799792 + ... + 486801200.

It is an arithmetic number, because the mean of its divisors is an integer number (2703244950).

Almost surely, 2^685901898864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685901898864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1297557576000).

685901898864 is an abundant number, since it is smaller than the sum of its proper divisors (1909213253136).

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

685901898864 is a wasteful number, since it uses less digits than its factorization.

685901898864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 238878720, while the sum is 72.

The spelling of 685901898864 in words is "six hundred eighty-five billion, nine hundred one million, eight hundred ninety-eight thousand, eight hundred sixty-four".