856778466480 has 80 divisors (see below), whose sum is σ = 2656750251744. Its totient is φ = 228410859520.

The previous prime is 856778466473. The next prime is 856778466539. The reversal of 856778466480 is 84664877658.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374590 + ... + 1361570.

Almost surely, 2^856778466480 is an apocalyptic number.

856778466480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

856778466480 is an abundant number, since it is smaller than the sum of its proper divisors (1799971785264).

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

856778466480 is a wasteful number, since it uses less digits than its factorization.

856778466480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990614 (or 990608 counting only the distinct ones).

The product of its (nonzero) digits is 433520640, while the sum is 69.

The spelling of 856778466480 in words is "eight hundred fifty-six billion, seven hundred seventy-eight million, four hundred sixty-six thousand, four hundred eighty".