6600660666660 has 72 divisors (see below), whose sum is σ = 20763559742016. Its totient is φ = 1760176176480.

The previous prime is 6600660666643. The next prime is 6600660666667. The reversal of 6600660666660 is 666660660066.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 6600660666597 and 6600660666606.

It is not an unprimeable number, because it can be changed into a prime (6600660666667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 679075456 + ... + 679085175.

Almost surely, 2^{6600660666660} is an apocalyptic number.

6600660666660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6600660666660 is an abundant number, since it is smaller than the sum of its proper divisors (14162899075356).

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

6600660666660 is a wasteful number, since it uses less digits than its factorization.

6600660666660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358160655 (or 1358160641 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 54.

The spelling of 6600660666660 in words is "six trillion, six hundred billion, six hundred sixty million, six hundred sixty-six thousand, six hundred sixty".