1812664668 has 24 divisors (see below), whose sum is σ = 4235203840. Its totient is φ = 603414000.

The previous prime is 1812664663. The next prime is 1812664709. The reversal of 1812664668 is 8664662181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812664663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 91558 + ... + 109581.

Almost surely, 2^1812664668 is an apocalyptic number.

It is an amenable number.

1812664668 is an abundant number, since it is smaller than the sum of its proper divisors (2422539172).

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

1812664668 is a wasteful number, since it uses less digits than its factorization.

1812664668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201897 (or 201895 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The square root of 1812664668 is about 42575.3997984752. The cubic root of 1812664668 is about 1219.2866626290.

The spelling of 1812664668 in words is "one billion, eight hundred twelve million, six hundred sixty-four thousand, six hundred sixty-eight".