6686144894 has 64 divisors (see below), whose sum is σ = 12128320512. Its totient is φ = 2724009600.

The previous prime is 6686144893. The next prime is 6686144921. The reversal of 6686144894 is 4984416866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686144893) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1759004 + ... + 1762800.

It is an arithmetic number, because the mean of its divisors is an integer number (189505008).

Almost surely, 2^6686144894 is an apocalyptic number.

6686144894 is a deficient number, since it is larger than the sum of its proper divisors (5442175618).

6686144894 is a wasteful number, since it uses less digits than its factorization.

6686144894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001.

The product of its digits is 7962624, while the sum is 56.

The square root of 6686144894 is about 81768.8503893750. The cubic root of 6686144894 is about 1883.9032468723.

The spelling of 6686144894 in words is "six billion, six hundred eighty-six million, one hundred forty-four thousand, eight hundred ninety-four".