206256590655 has 16 divisors (see below), whose sum is σ = 331325334144. Its totient is φ = 109565252000.

The previous prime is 206256590629. The next prime is 206256590669. The reversal of 206256590655 is 556095652602.

It is not a de Polignac number, because 206256590655 - 2⁹ = 206256590143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206256590598 and 206256590607.

It is a congruent number.

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, 27387549 + ... + 27395078.

It is an arithmetic number, because the mean of its divisors is an integer number (20707833384).

Almost surely, 2^206256590655 is an apocalyptic number.

206256590655 is a deficient number, since it is larger than the sum of its proper divisors (125068743489).

206256590655 is a wasteful number, since it uses less digits than its factorization.

206256590655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54782886.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 206256590655 in words is "two hundred six billion, two hundred fifty-six million, five hundred ninety thousand, six hundred fifty-five".