215636661025016 has 72 divisors (see below), whose sum is σ = 516974256068760. Its totient is φ = 84014283497760.

The previous prime is 215636661024989. The next prime is 215636661025057. The reversal of 215636661025016 is 610520166636512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2273066300 + ... + 2273161163.

It is an arithmetic number, because the mean of its divisors is an integer number (7180198000955).

Almost surely, 2^{215636661025016} is an apocalyptic number.

It is an amenable number.

215636661025016 is an abundant number, since it is smaller than the sum of its proper divisors (301337595043744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215636661025016 is a wasteful number, since it uses less digits than its factorization.

215636661025016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546227505 (or 4546227483 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 215636661025016 in words is "two hundred fifteen trillion, six hundred thirty-six billion, six hundred sixty-one million, twenty-five thousand, sixteen".