205378282818 has 12 divisors (see below), whose sum is σ = 444986279478. Its totient is φ = 68459427600.

The previous prime is 205378282789. The next prime is 205378282829. The reversal of 205378282818 is 818282873502.

205378282818 is a `hidden beast` number, since 2 + 0 + 537 + 8 + 28 + 2 + 81 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 187612858449 + 17765424369 = 433143^2 + 133287^2 .

It is a super-2 number, since 2×205378282818² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5704952283 + ... + 5704952318.

Almost surely, 2^205378282818 is an apocalyptic number.

205378282818 is an abundant number, since it is smaller than the sum of its proper divisors (239607996660).

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

205378282818 is a wasteful number, since it uses less digits than its factorization.

205378282818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11409904609 (or 11409904606 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 205378282818 in words is "two hundred five billion, three hundred seventy-eight million, two hundred eighty-two thousand, eight hundred eighteen".