205709585145 has 32 divisors (see below), whose sum is σ = 331055472384. Its totient is φ = 109072108800.

The previous prime is 205709585119. The next prime is 205709585167. The reversal of 205709585145 is 541585907502.

It is not a de Polignac number, because 205709585145 - 2⁵ = 205709585113 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10608679 + ... + 10628051.

It is an arithmetic number, because the mean of its divisors is an integer number (10345483512).

Almost surely, 2^205709585145 is an apocalyptic number.

It is an amenable number.

205709585145 is a deficient number, since it is larger than the sum of its proper divisors (125345887239).

205709585145 is a wasteful number, since it uses less digits than its factorization.

205709585145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23473.

The product of its (nonzero) digits is 2520000, while the sum is 51.

The spelling of 205709585145 in words is "two hundred five billion, seven hundred nine million, five hundred eighty-five thousand, one hundred forty-five".