6659493867 has 32 divisors (see below), whose sum is σ = 10631093760. Its totient is φ = 4095735840.

The previous prime is 6659493857. The next prime is 6659493871. The reversal of 6659493867 is 7683949566.

6659493867 is a `hidden beast` number, since 6 + 6 + 594 + 9 + 38 + 6 + 7 = 666.

It is not a de Polignac number, because 6659493867 - 2⁸ = 6659493611 is a prime.

It is a super-2 number, since 2×6659493867² = 88697717129221227378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6659493847) 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 31 ways as a sum of consecutive naturals, for example, 727992 + ... + 737082.

It is an arithmetic number, because the mean of its divisors is an integer number (332221680).

Almost surely, 2^6659493867 is an apocalyptic number.

6659493867 is a deficient number, since it is larger than the sum of its proper divisors (3971599893).

6659493867 is a wasteful number, since it uses less digits than its factorization.

6659493867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11200 (or 11194 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The square root of 6659493867 is about 81605.7220236424. The cubic root of 6659493867 is about 1881.3968292488.

It can be divided in two parts, 66594 and 93867, that added together give a triangular number (160461 = T₅₆₆).

The spelling of 6659493867 in words is "six billion, six hundred fifty-nine million, four hundred ninety-three thousand, eight hundred sixty-seven".