2643126205 has 4 divisors (see below), whose sum is σ = 3171751452. Its totient is φ = 2114500960.

The previous prime is 2643126203. The next prime is 2643126209. The reversal of 2643126205 is 5026213462.

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 644499769 + 1998626436 = 25387^2 + 44706^2 .

It is not a de Polignac number, because 2643126205 - 2¹ = 2643126203 is a prime.

It is a super-2 number, since 2×2643126205² = 13972232271115404050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643126203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264312616 + ... + 264312625.

It is an arithmetic number, because the mean of its divisors is an integer number (792937863).

Almost surely, 2^2643126205 is an apocalyptic number.

It is an amenable number.

2643126205 is a deficient number, since it is larger than the sum of its proper divisors (528625247).

2643126205 is an equidigital number, since it uses as much as digits as its factorization.

2643126205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528625246.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2643126205 is about 51411.3431549887. The cubic root of 2643126205 is about 1382.6299712018.

Adding to 2643126205 its reverse (5026213462), we get a palindrome (7669339667).

The spelling of 2643126205 in words is "two billion, six hundred forty-three million, one hundred twenty-six thousand, two hundred five".