215634640255265 has 24 divisors (see below), whose sum is σ = 328372750878912. Its totient is φ = 134421593923680.

The previous prime is 215634640255253. The next prime is 215634640255273. The reversal of 215634640255265 is 562552046436512.

It is a happy number.

It is not a de Polignac number, because 215634640255265 - 2¹⁶ = 215634640189729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215634640255265.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40006424069 + ... + 40006429458.

It is an arithmetic number, because the mean of its divisors is an integer number (13682197953288).

Almost surely, 2^{215634640255265} is an apocalyptic number.

It is an amenable number.

215634640255265 is a deficient number, since it is larger than the sum of its proper divisors (112738110623647).

215634640255265 is a wasteful number, since it uses less digits than its factorization.

215634640255265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80012853557 (or 80012853550 counting only the distinct ones).

The product of its (nonzero) digits is 51840000, while the sum is 56.

The spelling of 215634640255265 in words is "two hundred fifteen trillion, six hundred thirty-four billion, six hundred forty million, two hundred fifty-five thousand, two hundred sixty-five".