215125065 has 20 divisors (see below), whose sum is σ = 385632324. Its totient is φ = 114733152.

The previous prime is 215125061. The next prime is 215125069. The reversal of 215125065 is 560521512.

215125065 is a `hidden beast` number, since 2 + 151 + 2 + 506 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (215125061) and next prime (215125069).

It can be written as a sum of positive squares in 2 ways, for example, as 99261369 + 115863696 = 9963^2 + 10764^2 .

It is not a de Polignac number, because 215125065 - 2² = 215125061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (215125061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 265182 + ... + 265991.

Almost surely, 2^215125065 is an apocalyptic number.

It is an amenable number.

215125065 is a deficient number, since it is larger than the sum of its proper divisors (170507259).

215125065 is an equidigital number, since it uses as much as digits as its factorization.

215125065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531190 (or 531181 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 215125065 is about 14667.1423597100. The cubic root of 215125065 is about 599.1887786943.

Adding to 215125065 its reverse (560521512), we get a palindrome (775646577).

The spelling of 215125065 in words is "two hundred fifteen million, one hundred twenty-five thousand, sixty-five".