1668805413 has 16 divisors (see below), whose sum is σ = 2492959296. Its totient is φ = 984061440.

The previous prime is 1668805403. The next prime is 1668805417. The reversal of 1668805413 is 3145088661.

It is not a de Polignac number, because 1668805413 - 2⁶ = 1668805349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668805417) 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 15 ways as a sum of consecutive naturals, for example, 682156 + ... + 684597.

It is an arithmetic number, because the mean of its divisors is an integer number (155809956).

Almost surely, 2^1668805413 is an apocalyptic number.

It is an amenable number.

1668805413 is a deficient number, since it is larger than the sum of its proper divisors (824153883).

1668805413 is a wasteful number, since it uses less digits than its factorization.

1668805413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366804.

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

The square root of 1668805413 is about 40851.0148343955. The cubic root of 1668805413 is about 1186.1380375512.

The spelling of 1668805413 in words is "one billion, six hundred sixty-eight million, eight hundred five thousand, four hundred thirteen".