205265315663 has 4 divisors (see below), whose sum is σ = 205270620960. Its totient is φ = 205260010368.

The previous prime is 205265315659. The next prime is 205265315677. The reversal of 205265315663 is 366513562502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205265315663 - 2² = 205265315659 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 (205265314663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2594183 + ... + 2672136.

It is an arithmetic number, because the mean of its divisors is an integer number (51317655240).

Almost surely, 2^205265315663 is an apocalyptic number.

205265315663 is a deficient number, since it is larger than the sum of its proper divisors (5305297).

205265315663 is an equidigital number, since it uses as much as digits as its factorization.

205265315663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305296.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 205265315663 in words is "two hundred five billion, two hundred sixty-five million, three hundred fifteen thousand, six hundred sixty-three".