215804640055665 has 16 divisors (see below), whose sum is σ = 350150627246976. Its totient is φ = 113474740310400.

The previous prime is 215804640055651. The next prime is 215804640055727. The reversal of 215804640055665 is 566550046408512.

215804640055665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215804640055665 - 2⁴ = 215804640055649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101316731356 + ... + 101316733485.

It is an arithmetic number, because the mean of its divisors is an integer number (21884414202936).

Almost surely, 2^{215804640055665} is an apocalyptic number.

It is an amenable number.

215804640055665 is a deficient number, since it is larger than the sum of its proper divisors (134345987191311).

215804640055665 is a wasteful number, since it uses less digits than its factorization.

215804640055665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202633464920.

The product of its (nonzero) digits is 34560000, while the sum is 57.

The spelling of 215804640055665 in words is "two hundred fifteen trillion, eight hundred four billion, six hundred forty million, fifty-five thousand, six hundred sixty-five".