215620065 has 12 divisors (see below), whose sum is σ = 373741524. Its totient is φ = 114997344.

The previous prime is 215620063. The next prime is 215620079. The reversal of 215620065 is 560026512.

215620065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64256256 + 151363809 = 8016^2 + 12303^2 .

It is not a de Polignac number, because 215620065 - 2¹ = 215620063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215620063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2395734 + ... + 2395823.

It is an arithmetic number, because the mean of its divisors is an integer number (31145127).

Almost surely, 2^215620065 is an apocalyptic number.

It is an amenable number.

215620065 is a deficient number, since it is larger than the sum of its proper divisors (158121459).

215620065 is a wasteful number, since it uses less digits than its factorization.

215620065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791568 (or 4791565 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 215620065 is about 14684.0071165878. The cubic root of 215620065 is about 599.6480018692.

Adding to 215620065 its reverse (560026512), we get a palindrome (775646577).

The spelling of 215620065 in words is "two hundred fifteen million, six hundred twenty thousand, sixty-five".