205610561057 has 8 divisors (see below), whose sum is σ = 224308539840. Its totient is φ = 186913600560.

The previous prime is 205610561027. The next prime is 205610561059. The reversal of 205610561057 is 750165016502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205610561057 - 2²⁶ = 205543452193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205610561057.

It is not an unprimeable number, because it can be changed into a prime (205610561059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203468 + ... + 672770.

It is an arithmetic number, because the mean of its divisors is an integer number (28038567480).

Almost surely, 2^205610561057 is an apocalyptic number.

It is an amenable number.

205610561057 is a deficient number, since it is larger than the sum of its proper divisors (18697978783).

205610561057 is a wasteful number, since it uses less digits than its factorization.

205610561057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509143.

The product of its (nonzero) digits is 63000, while the sum is 38.

Adding to 205610561057 its reverse (750165016502), we get a palindrome (955775577559).

Subtracting 205610561057 from its reverse (750165016502), we obtain a palindrome (544554455445).

It can be divided in two parts, 205610 and 561057, that added together give a palindrome (766667).

The spelling of 205610561057 in words is "two hundred five billion, six hundred ten million, five hundred sixty-one thousand, fifty-seven".