6666178544 has 20 divisors (see below), whose sum is σ = 13216087896. Its totient is φ = 3255575232.

The previous prime is 6666178537. The next prime is 6666178591. The reversal of 6666178544 is 4458716666.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4843919 + ... + 4845294.

Almost surely, 2^6666178544 is an apocalyptic number.

It is an amenable number.

6666178544 is a deficient number, since it is larger than the sum of its proper divisors (6549909352).

6666178544 is a wasteful number, since it uses less digits than its factorization.

6666178544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9689264 (or 9689258 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 53.

The square root of 6666178544 is about 81646.6689093927. The cubic root of 6666178544 is about 1882.0261225394.

The spelling of 6666178544 in words is "six billion, six hundred sixty-six million, one hundred seventy-eight thousand, five hundred forty-four".