6660001555560 has 128 divisors (see below), whose sum is σ = 22227048345600. Its totient is φ = 1773836962560.

The previous prime is 6660001555481. The next prime is 6660001555589. The reversal of 6660001555560 is 655551000666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2868904 + ... + 4642263.

It is an arithmetic number, because the mean of its divisors is an integer number (173648815200).

Almost surely, 2^{6660001555560} is an apocalyptic number.

6660001555560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6660001555560 is an abundant number, since it is smaller than the sum of its proper divisors (15567046790040).

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

6660001555560 is a wasteful number, since it uses less digits than its factorization.

6660001555560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512008 (or 7511998 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 6660001555560 in words is "six trillion, six hundred sixty billion, one million, five hundred fifty-five thousand, five hundred sixty".