6609680823666 has 16 divisors (see below), whose sum is σ = 13219820887104. Its totient is φ = 2203150401264.

The previous prime is 6609680823659. The next prime is 6609680823673. The reversal of 6609680823666 is 6663280869066.

It is an interprime number because it is at equal distance from previous prime (6609680823659) and next prime (6609680823673).

It is a junction number, because it is equal to n+sod(n) for n = 6609680823597 and 6609680823606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18947745 + ... + 19293428.

It is an arithmetic number, because the mean of its divisors is an integer number (826238805444).

Almost surely, 2^{6609680823666} is an apocalyptic number.

6609680823666 is an abundant number, since it is smaller than the sum of its proper divisors (6610140063438).

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

6609680823666 is a wasteful number, since it uses less digits than its factorization.

6609680823666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38269985.

The product of its (nonzero) digits is 161243136, while the sum is 66.

The spelling of 6609680823666 in words is "six trillion, six hundred nine billion, six hundred eighty million, eight hundred twenty-three thousand, six hundred sixty-six".