205243505504 has 24 divisors (see below), whose sum is σ = 407649027240. Its totient is φ = 101713593856.

The previous prime is 205243505461. The next prime is 205243505563. The reversal of 205243505504 is 405505342502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28376294 + ... + 28383525.

It is an arithmetic number, because the mean of its divisors is an integer number (16985376135).

Almost surely, 2^205243505504 is an apocalyptic number.

It is an amenable number.

205243505504 is a deficient number, since it is larger than the sum of its proper divisors (202405521736).

205243505504 is a wasteful number, since it uses less digits than its factorization.

205243505504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56759942 (or 56759934 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 35.

The spelling of 205243505504 in words is "two hundred five billion, two hundred forty-three million, five hundred five thousand, five hundred four".