2168400205 has 4 divisors (see below), whose sum is σ = 2602080252. Its totient is φ = 1734720160.

The previous prime is 2168400197. The next prime is 2168400217. The reversal of 2168400205 is 5020048612.

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 975250441 + 1193149764 = 31229^2 + 34542^2 .

It is not a de Polignac number, because 2168400205 - 2³ = 2168400197 is a prime.

It is a Duffinian number.

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, 216840016 + ... + 216840025.

It is an arithmetic number, because the mean of its divisors is an integer number (650520063).

Almost surely, 2^2168400205 is an apocalyptic number.

It is an amenable number.

2168400205 is a deficient number, since it is larger than the sum of its proper divisors (433680047).

2168400205 is an equidigital number, since it uses as much as digits as its factorization.

2168400205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433680046.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 2168400205 is about 46566.0842781525. The cubic root of 2168400205 is about 1294.3343587475.

Adding to 2168400205 its reverse (5020048612), we get a palindrome (7188448817).

The spelling of 2168400205 in words is "two billion, one hundred sixty-eight million, four hundred thousand, two hundred five".