206534205878 has 256 divisors, whose sum is σ = 478606786560. Its totient is φ = 64086681600.

The previous prime is 206534205853. The next prime is 206534205907. The reversal of 206534205878 is 878502435602.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 20040875 + ... + 20051177.

It is an arithmetic number, because the mean of its divisors is an integer number (1869557760).

Almost surely, 2^206534205878 is an apocalyptic number.

206534205878 is an abundant number, since it is smaller than the sum of its proper divisors (272072580682).

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

206534205878 is a wasteful number, since it uses less digits than its factorization.

206534205878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10403.

The product of its (nonzero) digits is 3225600, while the sum is 50.

The spelling of 206534205878 in words is "two hundred six billion, five hundred thirty-four million, two hundred five thousand, eight hundred seventy-eight".