1668739105 has 16 divisors (see below), whose sum is σ = 2194343424. Its totient is φ = 1208177280.

The previous prime is 1668739031. The next prime is 1668739147. The reversal of 1668739105 is 5019378661.

It is a happy number.

It is not a de Polignac number, because 1668739105 - 2¹⁵ = 1668706337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55764 + ... + 80293.

It is an arithmetic number, because the mean of its divisors is an integer number (137146464).

Almost surely, 2^1668739105 is an apocalyptic number.

It is an amenable number.

1668739105 is a deficient number, since it is larger than the sum of its proper divisors (525604319).

1668739105 is a wasteful number, since it uses less digits than its factorization.

1668739105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136296.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1668739105 is about 40850.2032430684. The cubic root of 1668739105 is about 1186.1223274146.

The spelling of 1668739105 in words is "one billion, six hundred sixty-eight million, seven hundred thirty-nine thousand, one hundred five".