1666610505000 has 640 divisors, whose sum is σ = 6628313260800. Its totient is φ = 379966464000.

The previous prime is 1666610504989. The next prime is 1666610505017. The reversal of 1666610505000 is 5050166661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 409182964 + ... + 409187036.

It is an arithmetic number, because the mean of its divisors is an integer number (10356739470).

Almost surely, 2^{1666610505000} is an apocalyptic number.

1666610505000 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 1666610505000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3314156630400).

1666610505000 is an abundant number, since it is smaller than the sum of its proper divisors (4961702755800).

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

1666610505000 is a wasteful number, since it uses less digits than its factorization.

1666610505000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548 (or 4523 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 1666610505000 in words is "one trillion, six hundred sixty-six billion, six hundred ten million, five hundred five thousand".