215068565 has 4 divisors (see below), whose sum is σ = 258082284. Its totient is φ = 172054848.

The previous prime is 215068549. The next prime is 215068571. The reversal of 215068565 is 565860512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102050404 + 113018161 = 10102^2 + 10631^2 .

It is a cyclic number.

It is not a de Polignac number, because 215068565 - 2⁴ = 215068549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21506852 + ... + 21506861.

It is an arithmetic number, because the mean of its divisors is an integer number (64520571).

Almost surely, 2^215068565 is an apocalyptic number.

It is an amenable number.

215068565 is a deficient number, since it is larger than the sum of its proper divisors (43013719).

215068565 is an equidigital number, since it uses as much as digits as its factorization.

215068565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43013718.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 215068565 is about 14665.2161593343. The cubic root of 215068565 is about 599.1363175361.

The spelling of 215068565 in words is "two hundred fifteen million, sixty-eight thousand, five hundred sixty-five".