2165989512 has 64 divisors (see below), whose sum is σ = 5707224000. Its totient is φ = 683126784.

The previous prime is 2165989489. The next prime is 2165989519. The reversal of 2165989512 is 2159895612.

It is not an unprimeable number, because it can be changed into a prime (2165989519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421068 + ... + 426180.

It is an arithmetic number, because the mean of its divisors is an integer number (89175375).

Almost surely, 2^2165989512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165989512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2853612000).

2165989512 is an abundant number, since it is smaller than the sum of its proper divisors (3541234488).

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

2165989512 is a wasteful number, since it uses less digits than its factorization.

2165989512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070 (or 6066 counting only the distinct ones).

The product of its digits is 388800, while the sum is 48.

The square root of 2165989512 is about 46540.1924362158. The cubic root of 2165989512 is about 1293.8545273057.

The spelling of 2165989512 in words is "two billion, one hundred sixty-five million, nine hundred eighty-nine thousand, five hundred twelve".