685465804800 has 840 divisors, whose sum is σ = 2902530761856. Its totient is φ = 156651356160.

The previous prime is 685465804789. The next prime is 685465804819. The reversal of 685465804800 is 8408564586.

685465804800 is a `hidden beast` number, since 6 + 8 + 54 + 6 + 580 + 4 + 8 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (840).

It is a super-2 number, since 2×685465804800² (a number of 24 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 116118649 + ... + 116124551.

Almost surely, 2^685465804800 is an apocalyptic number.

685465804800 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 685465804800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451265380928).

685465804800 is an abundant number, since it is smaller than the sum of its proper divisors (2217064957056).

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

685465804800 is an equidigital number, since it uses as much as digits as its factorization.

685465804800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5958 (or 5920 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 54.

The spelling of 685465804800 in words is "six hundred eighty-five billion, four hundred sixty-five million, eight hundred four thousand, eight hundred".