205131461605 has 24 divisors (see below), whose sum is σ = 298845019008. Its totient is φ = 132387356928.

The previous prime is 205131461599. The next prime is 205131461617. The reversal of 205131461605 is 506164131502.

It is not a de Polignac number, because 205131461605 - 2⁵ = 205131461573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10129849 + ... + 10150078.

It is an arithmetic number, because the mean of its divisors is an integer number (12451875792).

Almost surely, 2^205131461605 is an apocalyptic number.

It is an amenable number.

205131461605 is a deficient number, since it is larger than the sum of its proper divisors (93713557403).

205131461605 is a wasteful number, since it uses less digits than its factorization.

205131461605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20279973 (or 20279956 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 205131461605 in words is "two hundred five billion, one hundred thirty-one million, four hundred sixty-one thousand, six hundred five".