205253209805 has 16 divisors (see below), whose sum is σ = 281612031744. Its totient is φ = 140684100480.

The previous prime is 205253209801. The next prime is 205253209921. The reversal of 205253209805 is 508902352502.

It is not a de Polignac number, because 205253209805 - 2² = 205253209801 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 (205253209801) 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, 1187912 + ... + 1349681.

It is an arithmetic number, because the mean of its divisors is an integer number (17600751984).

Almost surely, 2^205253209805 is an apocalyptic number.

It is an amenable number.

205253209805 is a deficient number, since it is larger than the sum of its proper divisors (76358821939).

205253209805 is a wasteful number, since it uses less digits than its factorization.

205253209805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539916.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 205253209805 in words is "two hundred five billion, two hundred fifty-three million, two hundred nine thousand, eight hundred five".