2165509005 has 16 divisors (see below), whose sum is σ = 3779797824. Its totient is φ = 1049943680.

The previous prime is 2165508991. The next prime is 2165509009. The reversal of 2165509005 is 5009055612.

It is not a de Polignac number, because 2165509005 - 2⁶ = 2165508941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165509009) 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, 6561984 + ... + 6562313.

It is an arithmetic number, because the mean of its divisors is an integer number (236237364).

Almost surely, 2^2165509005 is an apocalyptic number.

It is an amenable number.

2165509005 is a deficient number, since it is larger than the sum of its proper divisors (1614288819).

2165509005 is a wasteful number, since it uses less digits than its factorization.

2165509005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13124316.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 2165509005 is about 46535.0298699807. The cubic root of 2165509005 is about 1293.7588432264.

The spelling of 2165509005 in words is "two billion, one hundred sixty-five million, five hundred nine thousand, five".