1666755643300 has 288 divisors, whose sum is σ = 4070559467520. Its totient is φ = 587267366400.

The previous prime is 1666755643279. The next prime is 1666755643307. The reversal of 1666755643300 is 33465576661.

It is not an unprimeable number, because it can be changed into a prime (1666755643307) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2719013794 + ... + 2719014406.

It is an arithmetic number, because the mean of its divisors is an integer number (14133887040).

Almost surely, 2^{1666755643300} is an apocalyptic number.

1666755643300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666755643300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035279733760).

1666755643300 is an abundant number, since it is smaller than the sum of its proper divisors (2403803824220).

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

1666755643300 is a wasteful number, since it uses less digits than its factorization.

1666755643300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 52.

The spelling of 1666755643300 in words is "one trillion, six hundred sixty-six billion, seven hundred fifty-five million, six hundred forty-three thousand, three hundred".