204242252505 has 16 divisors (see below), whose sum is σ = 340995761280. Its totient is φ = 104193148928.

The previous prime is 204242252471. The next prime is 204242252507. The reversal of 204242252505 is 505252242402.

It is a cyclic number.

It is not a de Polignac number, because 204242252505 - 2¹⁰ = 204242251481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204242252507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296002920 + ... + 296003609.

It is an arithmetic number, because the mean of its divisors is an integer number (21312235080).

Almost surely, 2^204242252505 is an apocalyptic number.

It is an amenable number.

204242252505 is a deficient number, since it is larger than the sum of its proper divisors (136753508775).

204242252505 is a wasteful number, since it uses less digits than its factorization.

204242252505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592006560.

The product of its (nonzero) digits is 64000, while the sum is 33.

Adding to 204242252505 its reverse (505252242402), we get a palindrome (709494494907).

The spelling of 204242252505 in words is "two hundred four billion, two hundred forty-two million, two hundred fifty-two thousand, five hundred five".