6666766 has 4 divisors (see below), whose sum is σ = 10000152. Its totient is φ = 3333382.

The previous prime is 6666761. The next prime is 6666769. The reversal of 6666766 is 6676666.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666690 + ... + 1666693.

It is an arithmetic number, because the mean of its divisors is an integer number (2500038).

Almost surely, 2^6666766 is an apocalyptic number.

6666766 is a deficient number, since it is larger than the sum of its proper divisors (3333386).

6666766 is a wasteful number, since it uses less digits than its factorization.

6666766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333385.

The product of its digits is 326592, while the sum is 43.

The square root of 6666766 is about 2582.0081332172. The cubic root of 6666766 is about 188.2081405340.

The spelling of 6666766 in words is "six million, six hundred sixty-six thousand, seven hundred sixty-six".