6778534674816 has 64 divisors (see below), whose sum is σ = 20006091932400. Its totient is φ = 2259511557120.

The previous prime is 6778534674767. The next prime is 6778534674833. The reversal of 6778534674816 is 6184764358776.

6778534674816 is a `hidden beast` number, since 6 + 7 + 7 + 8 + 534 + 6 + 7 + 4 + 81 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980687325 + ... + 980694236.

Almost surely, 2^{6778534674816} is an apocalyptic number.

It is an amenable number.

6778534674816 is an abundant number, since it is smaller than the sum of its proper divisors (13227557257584).

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

6778534674816 is a wasteful number, since it uses less digits than its factorization.

6778534674816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961381584 (or 1961381566 counting only the distinct ones).

The product of its digits is 1137991680, while the sum is 72.

The spelling of 6778534674816 in words is "six trillion, seven hundred seventy-eight billion, five hundred thirty-four million, six hundred seventy-four thousand, eight hundred sixteen".