1718889985 has 16 divisors (see below), whose sum is σ = 2082931200. Its totient is φ = 1361655936.

The previous prime is 1718889971. The next prime is 1718890003. The reversal of 1718889985 is 5899888171.

It is a cyclic number.

It is not a de Polignac number, because 1718889985 - 2¹⁹ = 1718365697 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281232 + ... + 287278.

It is an arithmetic number, because the mean of its divisors is an integer number (130183200).

Almost surely, 2^1718889985 is an apocalyptic number.

It is an amenable number.

1718889985 is a deficient number, since it is larger than the sum of its proper divisors (364041215).

1718889985 is a wasteful number, since it uses less digits than its factorization.

1718889985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6600.

The product of its digits is 11612160, while the sum is 64.

The square root of 1718889985 is about 41459.4981276908. The cubic root of 1718889985 is about 1197.8874834754.

The spelling of 1718889985 in words is "one billion, seven hundred eighteen million, eight hundred eighty-nine thousand, nine hundred eighty-five".