405544245000205 has 4 divisors (see below), whose sum is σ = 486653094000252. Its totient is φ = 324435396000160.

The previous prime is 405544245000149. The next prime is 405544245000227. The reversal of 405544245000205 is 502000542445504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64359126387396 + 341185118612809 = 8022414^2 + 18471197^2 .

It is a de Polignac number, because none of the positive numbers 2^k-405544245000205 is a prime.

It is a super-3 number, since 3×405544245000205³ (a number of 45 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 40554424500016 + ... + 40554424500025.

It is an arithmetic number, because the mean of its divisors is an integer number (121663273500063).

Almost surely, 2^{405544245000205} is an apocalyptic number.

It is an amenable number.

405544245000205 is a deficient number, since it is larger than the sum of its proper divisors (81108849000047).

405544245000205 is an equidigital number, since it uses as much as digits as its factorization.

405544245000205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81108849000046.

The product of its (nonzero) digits is 640000, while the sum is 40.

Adding to 405544245000205 its reverse (502000542445504), we get a palindrome (907544787445709).

The spelling of 405544245000205 in words is "four hundred five trillion, five hundred forty-four billion, two hundred forty-five million, two hundred five", and thus it is an aban number.