6666478 has 16 divisors (see below), whose sum is σ = 12307680. Its totient is φ = 2637216.

The previous prime is 6666467. The next prime is 6666479. The reversal of 6666478 is 8746666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666479) 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, 18133 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (769230).

Almost surely, 2^6666478 is an apocalyptic number.

6666478 is a deficient number, since it is larger than the sum of its proper divisors (5641202).

6666478 is a wasteful number, since it uses less digits than its factorization.

6666478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36651.

The product of its digits is 290304, while the sum is 43.

The square root of 6666478 is about 2581.9523620702. The cubic root of 6666478 is about 188.2054303381.

The spelling of 6666478 in words is "six million, six hundred sixty-six thousand, four hundred seventy-eight".