1668518997288 has 256 divisors, whose sum is σ = 4919422636800. Its totient is φ = 464925327360.

The previous prime is 1668518997263. The next prime is 1668518997317. The reversal of 1668518997288 is 8827998158661.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1796037208 + ... + 1796038136.

It is an arithmetic number, because the mean of its divisors is an integer number (19216494675).

Almost surely, 2^{1668518997288} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668518997288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459711318400).

1668518997288 is an abundant number, since it is smaller than the sum of its proper divisors (3250903639512).

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

1668518997288 is a wasteful number, since it uses less digits than its factorization.

1668518997288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412 (or 2408 counting only the distinct ones).

The product of its digits is 836075520, while the sum is 78.

The spelling of 1668518997288 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, nine hundred ninety-seven thousand, two hundred eighty-eight".