56778773856 has 48 divisors (see below), whose sum is σ = 170336323584. Its totient is φ = 16222506624.

The previous prime is 56778773809. The next prime is 56778773869. The reversal of 56778773856 is 65837787765.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42245440 + ... + 42246783.

It is an arithmetic number, because the mean of its divisors is an integer number (3548673408).

Almost surely, 2^56778773856 is an apocalyptic number.

56778773856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

56778773856 is an abundant number, since it is smaller than the sum of its proper divisors (113557549728).

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

56778773856 is a wasteful number, since it uses less digits than its factorization.

56778773856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84492243 (or 84492235 counting only the distinct ones).

The product of its digits is 414892800, while the sum is 69.

The spelling of 56778773856 in words is "fifty-six billion, seven hundred seventy-eight million, seven hundred seventy-three thousand, eight hundred fifty-six".