205695605268 has 72 divisors (see below), whose sum is σ = 529875145800. Its totient is φ = 67257305856.

The previous prime is 205695605243. The next prime is 205695605273. The reversal of 205695605268 is 862506596502.

205695605268 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 9 + 5 + 605 + 26 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 40901826564 + 164793778704 = 202242^2 + 405948^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12792738 + ... + 12808806.

It is an arithmetic number, because the mean of its divisors is an integer number (7359377025).

Almost surely, 2^205695605268 is an apocalyptic number.

It is an amenable number.

205695605268 is an abundant number, since it is smaller than the sum of its proper divisors (324179540532).

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

205695605268 is a wasteful number, since it uses less digits than its factorization.

205695605268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22841 (or 22836 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 54.

The spelling of 205695605268 in words is "two hundred five billion, six hundred ninety-five million, six hundred five thousand, two hundred sixty-eight".