205023235505 has 12 divisors (see below), whose sum is σ = 270427342836. Its totient is φ = 149107807200.

The previous prime is 205023235493. The next prime is 205023235511. The reversal of 205023235505 is 505532320502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 139062613921 + 65960621584 = 372911^2 + 256828^2 .

It is not a de Polignac number, because 205023235505 - 2¹² = 205023231409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169440086 + ... + 169441295.

It is an arithmetic number, because the mean of its divisors is an integer number (22535611903).

Almost surely, 2^205023235505 is an apocalyptic number.

It is an amenable number.

205023235505 is a deficient number, since it is larger than the sum of its proper divisors (65404107331).

205023235505 is a wasteful number, since it uses less digits than its factorization.

205023235505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338881408 (or 338881397 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 32.

The spelling of 205023235505 in words is "two hundred five billion, twenty-three million, two hundred thirty-five thousand, five hundred five".