205205551213242 has 16 divisors (see below), whose sum is σ = 432011686764960. Its totient is φ = 64801753014672.

The previous prime is 205205551213241. The next prime is 205205551213297. The reversal of 205205551213242 is 242312155502502.

It is a super-3 number, since 3×205205551213242³ (a number of 44 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205205551213242.

It is not an unprimeable number, because it can be changed into a prime (205205551213241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 900024347313 + ... + 900024347540.

It is an arithmetic number, because the mean of its divisors is an integer number (27000730422810).

Almost surely, 2^{205205551213242} is an apocalyptic number.

205205551213242 is an abundant number, since it is smaller than the sum of its proper divisors (226806135551718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205205551213242 is a wasteful number, since it uses less digits than its factorization.

205205551213242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800048694877.

The product of its (nonzero) digits is 240000, while the sum is 39.

The spelling of 205205551213242 in words is "two hundred five trillion, two hundred five billion, five hundred fifty-one million, two hundred thirteen thousand, two hundred forty-two".