6668646544 has 20 divisors (see below), whose sum is σ = 14766289024. Its totient is φ = 2857991328.

The previous prime is 6668646539. The next prime is 6668646571. The reversal of 6668646544 is 4456468666.

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, 29770632 + ... + 29770855.

Almost surely, 2^6668646544 is an apocalyptic number.

It is an amenable number.

6668646544 is an abundant number, since it is smaller than the sum of its proper divisors (8097642480).

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

6668646544 is a wasteful number, since it uses less digits than its factorization.

6668646544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59541502 (or 59541496 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 55.

The square root of 6668646544 is about 81661.7814157884. The cubic root of 6668646544 is about 1882.2583529115.

The spelling of 6668646544 in words is "six billion, six hundred sixty-eight million, six hundred forty-six thousand, five hundred forty-four".