6659618816 has 24 divisors (see below), whose sum is σ = 13315989960. Its totient is φ = 3329808384.

The previous prime is 6659618809. The next prime is 6659618827. The reversal of 6659618816 is 6188169566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1623836 + ... + 1627931.

It is an arithmetic number, because the mean of its divisors is an integer number (554832915).

Almost surely, 2^6659618816 is an apocalyptic number.

It is an amenable number.

6659618816 is a deficient number, since it is larger than the sum of its proper divisors (6656371144).

6659618816 is an equidigital number, since it uses as much as digits as its factorization.

6659618816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251789 (or 3251769 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 56.

The square root of 6659618816 is about 81606.4875852404. The cubic root of 6659618816 is about 1881.4085957677.

The spelling of 6659618816 in words is "six billion, six hundred fifty-nine million, six hundred eighteen thousand, eight hundred sixteen".