1668644933712 has 160 divisors (see below), whose sum is σ = 4667783956992. Its totient is φ = 511650619392.

The previous prime is 1668644933701. The next prime is 1668644933713. The reversal of 1668644933712 is 2173394468661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668644933713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28082338 + ... + 28141694.

Almost surely, 2^{1668644933712} is an apocalyptic number.

1668644933712 is a gapful number since it is divisible by the number (12) 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 1668644933712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2333891978496).

1668644933712 is an abundant number, since it is smaller than the sum of its proper divisors (2999139023280).

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

1668644933712 is a wasteful number, since it uses less digits than its factorization.

1668644933712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60165 (or 60159 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 60.

The spelling of 1668644933712 in words is "one trillion, six hundred sixty-eight billion, six hundred forty-four million, nine hundred thirty-three thousand, seven hundred twelve".