1668835221 has 16 divisors (see below), whose sum is σ = 2289565440. Its totient is φ = 1080747200.

The previous prime is 1668835193. The next prime is 1668835249. The reversal of 1668835221 is 1225388661.

It is an interprime number because it is at equal distance from previous prime (1668835193) and next prime (1668835249).

It is a cyclic number.

It is not a de Polignac number, because 1668835221 - 2⁹ = 1668834709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668835271) 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 15 ways as a sum of consecutive naturals, for example, 35901 + ... + 68018.

It is an arithmetic number, because the mean of its divisors is an integer number (143097840).

Almost surely, 2^1668835221 is an apocalyptic number.

It is an amenable number.

1668835221 is a deficient number, since it is larger than the sum of its proper divisors (620730219).

1668835221 is a wasteful number, since it uses less digits than its factorization.

1668835221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104076.

The product of its digits is 138240, while the sum is 42.

The square root of 1668835221 is about 40851.3796707039. The cubic root of 1668835221 is about 1186.1450997271.

The spelling of 1668835221 in words is "one billion, six hundred sixty-eight million, eight hundred thirty-five thousand, two hundred twenty-one".