1668430355508 has 108 divisors (see below), whose sum is σ = 4933085540292. Its totient is φ = 474060625920.

The previous prime is 1668430355429. The next prime is 1668430355509. The reversal of 1668430355508 is 8055530348661.

It is a happy number.

1668430355508 is a `hidden beast` number, since 1 + 6 + 6 + 84 + 3 + 0 + 3 + 5 + 550 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 69591495204 + 1598838860304 = 263802^2 + 1264452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668430355509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2293485 + ... + 2932052.

Almost surely, 2^{1668430355508} is an apocalyptic number.

1668430355508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1668430355508 is an abundant number, since it is smaller than the sum of its proper divisors (3264655184784).

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

1668430355508 is a wasteful number, since it uses less digits than its factorization.

1668430355508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225742 (or 5225730 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 1668430355508 in words is "one trillion, six hundred sixty-eight billion, four hundred thirty million, three hundred fifty-five thousand, five hundred eight".