2165545520 has 40 divisors (see below), whose sum is σ = 5299891440. Its totient is φ = 820627200.

The previous prime is 2165545513. The next prime is 2165545537. The reversal of 2165545520 is 255455612.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710831 + ... + 713870.

It is an arithmetic number, because the mean of its divisors is an integer number (132497286).

Almost surely, 2^2165545520 is an apocalyptic number.

2165545520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165545520 is an abundant number, since it is smaller than the sum of its proper divisors (3134345920).

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

2165545520 is a wasteful number, since it uses less digits than its factorization.

2165545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424733 (or 1424727 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 2165545520 is about 46535.4222071746. The cubic root of 2165545520 is about 1293.7661150100.

The spelling of 2165545520 in words is "two billion, one hundred sixty-five million, five hundred forty-five thousand, five hundred twenty".