215645032609 has 16 divisors (see below), whose sum is σ = 231465435264. Its totient is φ = 200443161600.

The previous prime is 215645032607. The next prime is 215645032613. The reversal of 215645032609 is 906230546512.

It is a cyclic number.

It is not a de Polignac number, because 215645032609 - 2¹ = 215645032607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215645032607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 809472 + ... + 1042369.

It is an arithmetic number, because the mean of its divisors is an integer number (14466589704).

Almost surely, 2^215645032609 is an apocalyptic number.

It is an amenable number.

215645032609 is a deficient number, since it is larger than the sum of its proper divisors (15820402655).

215645032609 is a wasteful number, since it uses less digits than its factorization.

215645032609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852008.

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 215645032609 in words is "two hundred fifteen billion, six hundred forty-five million, thirty-two thousand, six hundred nine".