215611055605 has 16 divisors (see below), whose sum is σ = 297109972800. Its totient is φ = 148554984960.

The previous prime is 215611055591. The next prime is 215611055617. The reversal of 215611055605 is 506550116512.

It is not a de Polignac number, because 215611055605 - 2⁷ = 215611055477 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 103162140 + ... + 103164229.

It is an arithmetic number, because the mean of its divisors is an integer number (18569373300).

Almost surely, 2^215611055605 is an apocalyptic number.

It is an amenable number.

215611055605 is a deficient number, since it is larger than the sum of its proper divisors (81498917195).

215611055605 is a wasteful number, since it uses less digits than its factorization.

215611055605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206326404.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 215611055605 in words is "two hundred fifteen billion, six hundred eleven million, fifty-five thousand, six hundred five".