856128670974384 has 20 divisors (see below), whose sum is σ = 2211665733350616. Its totient is φ = 285376223658112.

The previous prime is 856128670974371. The next prime is 856128670974419. The reversal of 856128670974384 is 483479076821658.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8918006989269 + ... + 8918006989364.

It is a 1-persistent number, because it is pandigital, but 2⋅856128670974384 = 1712257341948768 is not.

Almost surely, 2^{856128670974384} is an apocalyptic number.

It is an amenable number.

856128670974384 is an abundant number, since it is smaller than the sum of its proper divisors (1355537062376232).

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

856128670974384 is a wasteful number, since it uses less digits than its factorization.

856128670974384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17836013978644 (or 17836013978638 counting only the distinct ones).

The product of its (nonzero) digits is 3901685760, while the sum is 78.

The spelling of 856128670974384 in words is "eight hundred fifty-six trillion, one hundred twenty-eight billion, six hundred seventy million, nine hundred seventy-four thousand, three hundred eighty-four".