205856601263 has 16 divisors (see below), whose sum is σ = 218426453280. Its totient is φ = 193338240000.

The previous prime is 205856601257. The next prime is 205856601281. The reversal of 205856601263 is 362106658502.

It is a cyclic number.

It is not a de Polignac number, because 205856601263 - 2⁶ = 205856601199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205856601763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40753088 + ... + 40758138.

It is an arithmetic number, because the mean of its divisors is an integer number (13651653330).

Almost surely, 2^205856601263 is an apocalyptic number.

205856601263 is a deficient number, since it is larger than the sum of its proper divisors (12569852017).

205856601263 is a wasteful number, since it uses less digits than its factorization.

205856601263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9658.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 205856601263 in words is "two hundred five billion, eight hundred fifty-six million, six hundred one thousand, two hundred sixty-three".