205354171550 has 96 divisors (see below), whose sum is σ = 441453888000. Its totient is φ = 70240089600.

The previous prime is 205354171549. The next prime is 205354171579. The reversal of 205354171550 is 55171453502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18685157 + ... + 18696143.

It is an arithmetic number, because the mean of its divisors is an integer number (4598478000).

Almost surely, 2^205354171550 is an apocalyptic number.

205354171550 is an abundant number, since it is smaller than the sum of its proper divisors (236099716450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205354171550 is a wasteful number, since it uses less digits than its factorization.

205354171550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026 (or 13021 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 38.

The spelling of 205354171550 in words is "two hundred five billion, three hundred fifty-four million, one hundred seventy-one thousand, five hundred fifty".