6777666 has 24 divisors (see below), whose sum is σ = 16783104. Its totient is φ = 1936440.

The previous prime is 6777637. The next prime is 6777691. The reversal of 6777666 is 6667776.

It is a happy number.

It is a super-3 number, since 3×6777666³ (a number of 21 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26770 + ... + 27021.

It is an arithmetic number, because the mean of its divisors is an integer number (699296).

Almost surely, 2^6777666 is an apocalyptic number.

6777666 is an abundant number, since it is smaller than the sum of its proper divisors (10005438).

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

6777666 is a wasteful number, since it uses less digits than its factorization.

6777666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53806 (or 53803 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 6777666 is about 2603.3950910302. The cubic root of 6777666 is about 189.2460053474.

The spelling of 6777666 in words is "six million, seven hundred seventy-seven thousand, six hundred sixty-six".