1668522240000 has 3600 divisors, whose sum is σ = 8234968341600. Its totient is φ = 328458240000.

The previous prime is 1668522239963. The next prime is 1668522240001. The reversal of 1668522240000 is 422258661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (3600).

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

It is not an unprimeable number, because it can be changed into a prime (1668522240001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 299 ways as a sum of consecutive naturals, for example, 87816959991 + ... + 87816960009.

It is an arithmetic number, because the mean of its divisors is an integer number (2287491206).

Almost surely, 2^{1668522240000} is an apocalyptic number.

1668522240000 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 1668522240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4117484170800).

1668522240000 is an abundant number, since it is smaller than the sum of its proper divisors (6566446101600).

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

1668522240000 is an equidigital number, since it uses as much as digits as its factorization.

1668522240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 1668522240000 its reverse (422258661), we get a palindrome (1668944498661).

The spelling of 1668522240000 in words is "one trillion, six hundred sixty-eight billion, five hundred twenty-two million, two hundred forty thousand".