2165615215 has 8 divisors (see below), whose sum is σ = 2610087840. Its totient is φ = 1724925792.

The previous prime is 2165615201. The next prime is 2165615219. The reversal of 2165615215 is 5125165612.

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

It is a cyclic number.

It is not a de Polignac number, because 2165615215 - 2⁵ = 2165615183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165615219) 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, 944539 + ... + 946828.

It is an arithmetic number, because the mean of its divisors is an integer number (326260980).

Almost surely, 2^2165615215 is an apocalyptic number.

2165615215 is a deficient number, since it is larger than the sum of its proper divisors (444472625).

2165615215 is a wasteful number, since it uses less digits than its factorization.

2165615215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891601.

The product of its digits is 18000, while the sum is 34.

The square root of 2165615215 is about 46536.1710393109. The cubic root of 2165615215 is about 1293.7799942014.

The spelling of 2165615215 in words is "two billion, one hundred sixty-five million, six hundred fifteen thousand, two hundred fifteen".