1668737979984 has 80 divisors (see below), whose sum is σ = 4614708211200. Its totient is φ = 518038178688.

The previous prime is 1668737979983. The next prime is 1668737980009. The reversal of 1668737979984 is 4899797378661.

It is a junction number, because it is equal to n+sod(n) for n = 1668737979897 and 1668737979906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668737979983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15452604 + ... + 15560219.

It is an arithmetic number, because the mean of its divisors is an integer number (57683852640).

Almost surely, 2^{1668737979984} is an apocalyptic number.

It is an amenable number.

1668737979984 is an abundant number, since it is smaller than the sum of its proper divisors (2945970231216).

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

1668737979984 is a wasteful number, since it uses less digits than its factorization.

1668737979984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31012912 (or 31012906 counting only the distinct ones).

The product of its digits is 6913299456, while the sum is 84.

The spelling of 1668737979984 in words is "one trillion, six hundred sixty-eight billion, seven hundred thirty-seven million, nine hundred seventy-nine thousand, nine hundred eighty-four".