1668836918 has 16 divisors (see below), whose sum is σ = 3011435520. Its totient is φ = 677572776.

The previous prime is 1668836887. The next prime is 1668836933. The reversal of 1668836918 is 8196388661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3136646 + ... + 3137177.

It is an arithmetic number, because the mean of its divisors is an integer number (188214720).

Almost surely, 2^1668836918 is an apocalyptic number.

1668836918 is a deficient number, since it is larger than the sum of its proper divisors (1342598602).

1668836918 is a wasteful number, since it uses less digits than its factorization.

1668836918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273851.

The product of its digits is 2985984, while the sum is 56.

The square root of 1668836918 is about 40851.4004411110. The cubic root of 1668836918 is about 1186.1455017814.

The spelling of 1668836918 in words is "one billion, six hundred sixty-eight million, eight hundred thirty-six thousand, nine hundred eighteen".