6655680865566 has 24 divisors (see below), whose sum is σ = 14438163951120. Its totient is φ = 2215864584576.

The previous prime is 6655680865541. The next prime is 6655680865583.

6655680865566 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 68 + 0 + 8 + 6 + 556 + 6 = 666.

6655680865566 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6655680865566² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6655680865494 and 6655680865503.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 224626771 + ... + 224656398.

It is an arithmetic number, because the mean of its divisors is an integer number (601590164630).

Almost surely, 2^{6655680865566} is an apocalyptic number.

6655680865566 is an abundant number, since it is smaller than the sum of its proper divisors (7782483085554).

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

6655680865566 is a wasteful number, since it uses less digits than its factorization.

6655680865566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449284000 (or 449283997 counting only the distinct ones).

The product of its (nonzero) digits is 1866240000, while the sum is 72.

The spelling of 6655680865566 in words is "six trillion, six hundred fifty-five billion, six hundred eighty million, eight hundred sixty-five thousand, five hundred sixty-six".