1668633318 has 96 divisors (see below), whose sum is σ = 4171305600. Its totient is φ = 493804080.

The previous prime is 1668633313. The next prime is 1668633331. The reversal of 1668633318 is 8133368661.

1668633318 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 633 + 3 + 1 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668633313) 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 47 ways as a sum of consecutive naturals, for example, 277993 + ... + 283931.

It is an arithmetic number, because the mean of its divisors is an integer number (43451100).

Almost surely, 2^1668633318 is an apocalyptic number.

1668633318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668633318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2085652800).

1668633318 is an abundant number, since it is smaller than the sum of its proper divisors (2502672282).

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

1668633318 is a wasteful number, since it uses less digits than its factorization.

1668633318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015 (or 5998 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 1668633318 is about 40848.9084064679. The cubic root of 1668633318 is about 1186.0972627867.

The spelling of 1668633318 in words is "one billion, six hundred sixty-eight million, six hundred thirty-three thousand, three hundred eighteen".