6666478766 has 8 divisors (see below), whose sum is σ = 10065941904. Its totient is φ = 3311164800.

The previous prime is 6666478759. The next prime is 6666478799. The reversal of 6666478766 is 6678746666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6666478699 and 6666478708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11036915 + ... + 11037518.

It is an arithmetic number, because the mean of its divisors is an integer number (1258242738).

Almost surely, 2^6666478766 is an apocalyptic number.

6666478766 is a deficient number, since it is larger than the sum of its proper divisors (3399463138).

6666478766 is a wasteful number, since it uses less digits than its factorization.

6666478766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22074586.

The product of its digits is 73156608, while the sum is 62.

The square root of 6666478766 is about 81648.5074327755. The cubic root of 6666478766 is about 1882.0543754662.

The spelling of 6666478766 in words is "six billion, six hundred sixty-six million, four hundred seventy-eight thousand, seven hundred sixty-six".