856645507782 has 12 divisors (see below), whose sum is σ = 1856065266900. Its totient is φ = 285548502588.

The previous prime is 856645507769. The next prime is 856645507807. The reversal of 856645507782 is 287705546658.

856645507782 is a `hidden beast` number, since 8 + 5 + 6 + 6 + 4 + 550 + 7 + 78 + 2 = 666.

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 5 ways as a sum of consecutive naturals, for example, 23795708532 + ... + 23795708567.

It is an arithmetic number, because the mean of its divisors is an integer number (154672105575).

Almost surely, 2^856645507782 is an apocalyptic number.

856645507782 is an abundant number, since it is smaller than the sum of its proper divisors (999419759118).

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

856645507782 is a wasteful number, since it uses less digits than its factorization.

856645507782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47591417107 (or 47591417104 counting only the distinct ones).

The product of its (nonzero) digits is 112896000, while the sum is 63.

The spelling of 856645507782 in words is "eight hundred fifty-six billion, six hundred forty-five million, five hundred seven thousand, seven hundred eighty-two".