1668420200 has 24 divisors (see below), whose sum is σ = 3879077430. Its totient is φ = 667368000.

The previous prime is 1668420181. The next prime is 1668420223. The reversal of 1668420200 is 20248661.

It can be written as a sum of positive squares in 3 ways, for example, as 1291827364 + 376592836 = 35942^2 + 19406^2 .

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 5 ways as a sum of consecutive naturals, for example, 4170851 + ... + 4171250.

Almost surely, 2^1668420200 is an apocalyptic number.

1668420200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668420200 is an abundant number, since it is smaller than the sum of its proper divisors (2210657230).

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

1668420200 is a wasteful number, since it uses less digits than its factorization.

1668420200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342117 (or 8342108 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1668420200 is about 40846.2997100105. The cubic root of 1668420200 is about 1186.0467644865.

Adding to 1668420200 its reverse (20248661), we get a palindrome (1688668861).

The spelling of 1668420200 in words is "one billion, six hundred sixty-eight million, four hundred twenty thousand, two hundred".