1668835689 has 4 divisors (see below), whose sum is σ = 2225114256. Its totient is φ = 1112557124.

The previous prime is 1668835687. The next prime is 1668835697. The reversal of 1668835689 is 9865388661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668835689 - 2¹ = 1668835687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668835687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278139279 + ... + 278139284.

It is an arithmetic number, because the mean of its divisors is an integer number (556278564).

Almost surely, 2^1668835689 is an apocalyptic number.

It is an amenable number.

1668835689 is a deficient number, since it is larger than the sum of its proper divisors (556278567).

1668835689 is an equidigital number, since it uses as much as digits as its factorization.

1668835689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556278566.

The product of its digits is 14929920, while the sum is 60.

The square root of 1668835689 is about 40851.3853987842. The cubic root of 1668835689 is about 1186.1452106060.

The spelling of 1668835689 in words is "one billion, six hundred sixty-eight million, eight hundred thirty-five thousand, six hundred eighty-nine".