685425818880 has 1152 divisors, whose sum is σ = 2788609904640. Its totient is φ = 157805936640.

The previous prime is 685425818873. The next prime is 685425818911. The reversal of 685425818880 is 88818524586.

685425818880 is a `hidden beast` number, since 6 + 8 + 5 + 42 + 581 + 8 + 8 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2421999219 + ... + 2421999501.

It is an arithmetic number, because the mean of its divisors is an integer number (2420668320).

Almost surely, 2^685425818880 is an apocalyptic number.

685425818880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685425818880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394304952320).

685425818880 is an abundant number, since it is smaller than the sum of its proper divisors (2103184085760).

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

685425818880 is a wasteful number, since it uses less digits than its factorization.

685425818880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 39321600, while the sum is 63.

The spelling of 685425818880 in words is "six hundred eighty-five billion, four hundred twenty-five million, eight hundred eighteen thousand, eight hundred eighty".