2165865015 has 8 divisors (see below), whose sum is σ = 3465384048. Its totient is φ = 1155128000.

The previous prime is 2165865007. The next prime is 2165865019. The reversal of 2165865015 is 5105685612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2165865015 - 2³ = 2165865007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165865019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72195486 + ... + 72195515.

It is an arithmetic number, because the mean of its divisors is an integer number (433173006).

Almost surely, 2^2165865015 is an apocalyptic number.

2165865015 is a deficient number, since it is larger than the sum of its proper divisors (1299519033).

2165865015 is a wasteful number, since it uses less digits than its factorization.

2165865015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144391009.

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 2165865015 is about 46538.8548956676. The cubic root of 2165865015 is about 1293.8297373898.

The spelling of 2165865015 in words is "two billion, one hundred sixty-five million, eight hundred sixty-five thousand, fifteen".