216565122015 has 32 divisors (see below), whose sum is σ = 420005088000. Its totient is φ = 105001270560.

The previous prime is 216565122013. The next prime is 216565122031. The reversal of 216565122015 is 510221565612.

It is not a de Polignac number, because 216565122015 - 2¹ = 216565122013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216565122013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72916065 + ... + 72919034.

It is an arithmetic number, because the mean of its divisors is an integer number (13125159000).

Almost surely, 2^216565122015 is an apocalyptic number.

216565122015 is a deficient number, since it is larger than the sum of its proper divisors (203439965985).

216565122015 is a wasteful number, since it uses less digits than its factorization.

216565122015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145835124 (or 145835118 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 216565122015 its reverse (510221565612), we get a palindrome (726786687627).

The spelling of 216565122015 in words is "two hundred sixteen billion, five hundred sixty-five million, one hundred twenty-two thousand, fifteen".