806565661155 has 20 divisors (see below), whose sum is σ = 1445843630352. Its totient is φ = 430168352400.

The previous prime is 806565661141. The next prime is 806565661163. The reversal of 806565661155 is 551166565608.

It is a happy number.

806565661155 is a `hidden beast` number, since 8 + 0 + 6 + 565 + 6 + 61 + 15 + 5 = 666.

It is not a de Polignac number, because 806565661155 - 2³⁹ = 256809847267 is a prime.

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 19 ways as a sum of consecutive naturals, for example, 995759671 + ... + 995760480.

Almost surely, 2^806565661155 is an apocalyptic number.

806565661155 is a deficient number, since it is larger than the sum of its proper divisors (639277969197).

806565661155 is a wasteful number, since it uses less digits than its factorization.

806565661155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991520168 (or 1991520159 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 54.

The spelling of 806565661155 in words is "eight hundred six billion, five hundred sixty-five million, six hundred sixty-one thousand, one hundred fifty-five".