215465222609 has 12 divisors (see below), whose sum is σ = 269923466484. Its totient is φ = 170477977824.

The previous prime is 215465222593. The next prime is 215465222659. The reversal of 215465222609 is 906222564512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62327619025 + 153137603584 = 249655^2 + 391328^2 .

It is not a de Polignac number, because 215465222609 - 2⁴ = 215465222593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215465222609.

It is not an unprimeable number, because it can be changed into a prime (215465222659) 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, 169124342 + ... + 169125615.

It is an arithmetic number, because the mean of its divisors is an integer number (22493622207).

Almost surely, 2^215465222609 is an apocalyptic number.

It is an amenable number.

215465222609 is a deficient number, since it is larger than the sum of its proper divisors (54458243875).

215465222609 is a wasteful number, since it uses less digits than its factorization.

215465222609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338249984 (or 338249977 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 215465222609 in words is "two hundred fifteen billion, four hundred sixty-five million, two hundred twenty-two thousand, six hundred nine".