6659891127 has 24 divisors (see below), whose sum is σ = 9873488768. Its totient is φ = 4323488400.

The previous prime is 6659891081. The next prime is 6659891131. The reversal of 6659891127 is 7211989566.

It is not a de Polignac number, because 6659891127 - 2⁷ = 6659890999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659891137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102102 + ... + 154092.

Almost surely, 2^6659891127 is an apocalyptic number.

6659891127 is a deficient number, since it is larger than the sum of its proper divisors (3213597641).

6659891127 is a wasteful number, since it uses less digits than its factorization.

6659891127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52371 (or 52368 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 6659891127 is about 81608.1560078403. The cubic root of 6659891127 is about 1881.4342389407.

The spelling of 6659891127 in words is "six billion, six hundred fifty-nine million, eight hundred ninety-one thousand, one hundred twenty-seven".