1668188196 has 84 divisors (see below), whose sum is σ = 4395224064. Its totient is φ = 553748400.

The previous prime is 1668188153. The next prime is 1668188209. The reversal of 1668188196 is 6918818661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 789181 + ... + 791291.

It is an arithmetic number, because the mean of its divisors is an integer number (52324096).

Almost surely, 2^1668188196 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 1668188196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2197612032).

1668188196 is an abundant number, since it is smaller than the sum of its proper divisors (2727035868).

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

1668188196 is a wasteful number, since it uses less digits than its factorization.

1668188196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404 (or 2387 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 1668188196 is about 40843.4596477820. The cubic root of 1668188196 is about 1185.9917862603.

The spelling of 1668188196 in words is "one billion, six hundred sixty-eight million, one hundred eighty-eight thousand, one hundred ninety-six".