1989568518 has 16 divisors (see below), whose sum is σ = 4547585280. Its totient is φ = 568448136.

The previous prime is 1989568507. The next prime is 1989568543. The reversal of 1989568518 is 8158659891.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23685298 + ... + 23685381.

It is an arithmetic number, because the mean of its divisors is an integer number (284224080).

Almost surely, 2^1989568518 is an apocalyptic number.

1989568518 is an abundant number, since it is smaller than the sum of its proper divisors (2558016762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989568518 is a wasteful number, since it uses less digits than its factorization.

1989568518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47370691.

The product of its digits is 6220800, while the sum is 60.

The square root of 1989568518 is about 44604.5795630897. The cubic root of 1989568518 is about 1257.7267565474.

The spelling of 1989568518 in words is "one billion, nine hundred eighty-nine million, five hundred sixty-eight thousand, five hundred eighteen".