285665616000 has 320 divisors, whose sum is σ = 1060974846360. Its totient is φ = 76177152000.

The previous prime is 285665615929. The next prime is 285665616023. The reversal of 285665616000 is 616566582.

It is a happy number.

285665616000 is a `hidden beast` number, since 2 + 85 + 6 + 6 + 561 + 6 + 0 + 0 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 25296266304 + 260369349696 = 159048^2 + 510264^2 .

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1185790 + ... + 1406210.

Almost surely, 2^285665616000 is an apocalyptic number.

285665616000 is a gapful number since it is divisible by the number (20) 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 285665616000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (530487423180).

285665616000 is an abundant number, since it is smaller than the sum of its proper divisors (775309230360).

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

285665616000 is an equidigital number, since it uses as much as digits as its factorization.

285665616000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220462 (or 220431 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 285665616000 in words is "two hundred eighty-five billion, six hundred sixty-five million, six hundred sixteen thousand".