1668046689 has 20 divisors (see below), whose sum is σ = 2622921840. Its totient is φ = 1053502200.

The previous prime is 1668046663. The next prime is 1668046703. The reversal of 1668046689 is 9866408661.

It is not a de Polignac number, because 1668046689 - 2⁷ = 1668046561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668046619) 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 19 ways as a sum of consecutive naturals, for example, 540387 + ... + 543464.

It is an arithmetic number, because the mean of its divisors is an integer number (131146092).

Almost surely, 2^1668046689 is an apocalyptic number.

1668046689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1668046689 is a deficient number, since it is larger than the sum of its proper divisors (954875151).

1668046689 is a wasteful number, since it uses less digits than its factorization.

1668046689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083882 (or 1083873 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 1668046689 is about 40841.7273018662. The cubic root of 1668046689 is about 1185.9582506985.

The spelling of 1668046689 in words is "one billion, six hundred sixty-eight million, forty-six thousand, six hundred eighty-nine".