215000165 has 8 divisors (see below), whose sum is σ = 258394488. Its totient is φ = 171737280.

The previous prime is 215000117. The next prime is 215000167. The reversal of 215000165 is 561000512.

It can be written as a sum of positive squares in 4 ways, for example, as 7150276 + 207849889 = 2674^2 + 14417^2 .

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

It is not a de Polignac number, because 215000165 - 2⁶ = 215000101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215000167) 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, 29222 + ... + 35831.

It is an arithmetic number, because the mean of its divisors is an integer number (32299311).

Almost surely, 2^215000165 is an apocalyptic number.

It is an amenable number.

215000165 is a deficient number, since it is larger than the sum of its proper divisors (43394323).

215000165 is an equidigital number, since it uses as much as digits as its factorization.

215000165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65719.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215000165 is about 14662.8839250674. The cubic root of 215000165 is about 599.0727947406.

Adding to 215000165 its reverse (561000512), we get a palindrome (776000677).

The spelling of 215000165 in words is "two hundred fifteen million, one hundred sixty-five", and thus it is an aban number.