856016640000 has 1920 divisors, whose sum is σ = 3536947814400. Its totient is φ = 203489280000.

The previous prime is 856016639971. The next prime is 856016640007. The reversal of 856016640000 is 46610658.

856016640000 is a `hidden beast` number, since 8 + 5 + 6 + 0 + 1 + 6 + 640 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1920).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856016640007) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 18213119977 + ... + 18213120023.

It is an arithmetic number, because the mean of its divisors is an integer number (1842160320).

Almost surely, 2^856016640000 is an apocalyptic number.

856016640000 is a gapful number since it is divisible by the number (80) 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 856016640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768473907200).

856016640000 is an abundant number, since it is smaller than the sum of its proper divisors (2680931174400).

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

856016640000 is a wasteful number, since it uses less digits than its factorization.

856016640000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 856016640000 in words is "eight hundred fifty-six billion, sixteen million, six hundred forty thousand".