2165013785 has 8 divisors (see below), whose sum is σ = 2834199936. Its totient is φ = 1574555440.

The previous prime is 2165013731. The next prime is 2165013787. The reversal of 2165013785 is 5873105612.

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

It is not a de Polignac number, because 2165013785 - 2²⁸ = 1896578329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2165013787) 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, 19681889 + ... + 19681998.

It is an arithmetic number, because the mean of its divisors is an integer number (354274992).

Almost surely, 2^2165013785 is an apocalyptic number.

It is an amenable number.

2165013785 is a deficient number, since it is larger than the sum of its proper divisors (669186151).

2165013785 is a wasteful number, since it uses less digits than its factorization.

2165013785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39363903.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 2165013785 is about 46529.7086279293. The cubic root of 2165013785 is about 1293.6602145132.

The spelling of 2165013785 in words is "two billion, one hundred sixty-five million, thirteen thousand, seven hundred eighty-five".