855785927640 has 256 divisors, whose sum is σ = 2946874245120. Its totient is φ = 194759677440.

The previous prime is 855785927597. The next prime is 855785927651. The reversal of 855785927640 is 46729587558.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 388462779 + ... + 388464981.

It is an arithmetic number, because the mean of its divisors is an integer number (11511227520).

Almost surely, 2^855785927640 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 855785927640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473437122560).

855785927640 is an abundant number, since it is smaller than the sum of its proper divisors (2091088317480).

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

855785927640 is a wasteful number, since it uses less digits than its factorization.

855785927640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022 (or 4018 counting only the distinct ones).

The product of its (nonzero) digits is 169344000, while the sum is 66.

The spelling of 855785927640 in words is "eight hundred fifty-five billion, seven hundred eighty-five million, nine hundred twenty-seven thousand, six hundred forty".