6566778 has 16 divisors (see below), whose sum is σ = 14592960. Its totient is φ = 2188908.

The previous prime is 6566773. The next prime is 6566779. The reversal of 6566778 is 8776656.

6566778 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (6566773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60750 + ... + 60857.

It is an arithmetic number, because the mean of its divisors is an integer number (912060).

Almost surely, 2^6566778 is an apocalyptic number.

6566778 is an abundant number, since it is smaller than the sum of its proper divisors (8026182).

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

6566778 is a wasteful number, since it uses less digits than its factorization.

6566778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121618 (or 121612 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 6566778 is about 2562.5725355587. The cubic root of 6566778 is about 187.2624832513.

The spelling of 6566778 in words is "six million, five hundred sixty-six thousand, seven hundred seventy-eight".