2566638244 has 27 divisors (see below), whose sum is σ = 4567150497. Its totient is φ = 1262091744.

The previous prime is 2566638229. The next prime is 2566638247. The reversal of 2566638244 is 4428366652.

The square root of 2566638244 is 50662.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1456948900 + 1109689344 = 38170^2 + 33312^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2566638194 and 2566638203.

It is not an unprimeable number, because it can be changed into a prime (2566638247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7396479 + ... + 7396825.

Almost surely, 2^2566638244 is an apocalyptic number.

2566638244 is the 50662-nd square number.

It is an amenable number.

2566638244 is a deficient number, since it is larger than the sum of its proper divisors (2000512253).

2566638244 is an frugal number, since it uses more digits than its factorization.

2566638244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 422 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The cubic root of 2566638244 is about 1369.1621573604.

The spelling of 2566638244 in words is "two billion, five hundred sixty-six million, six hundred thirty-eight thousand, two hundred forty-four".