1668851712 has 144 divisors (see below), whose sum is σ = 5258766240. Its totient is φ = 505651200.

The previous prime is 1668851669. The next prime is 1668851747. The reversal of 1668851712 is 2171588661.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198637 + ... + 206867.

It is an arithmetic number, because the mean of its divisors is an integer number (36519210).

Almost surely, 2^1668851712 is an apocalyptic number.

1668851712 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 1668851712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2629383120).

1668851712 is an abundant number, since it is smaller than the sum of its proper divisors (3589914528).

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

1668851712 is a wasteful number, since it uses less digits than its factorization.

1668851712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8270 (or 8247 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 1668851712 is about 40851.5815116135. The cubic root of 1668851712 is about 1186.1490067744.

The spelling of 1668851712 in words is "one billion, six hundred sixty-eight million, eight hundred fifty-one thousand, seven hundred twelve".