2555544221 has 2 divisors, whose sum is σ = 2555544222. Its totient is φ = 2555544220.

The previous prime is 2555544197. The next prime is 2555544239. The reversal of 2555544221 is 1224455552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2539656025 + 15888196 = 50395^2 + 3986^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555544221 - 2¹⁸ = 2555282077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555544281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277772110 + 1277772111.

It is an arithmetic number, because the mean of its divisors is an integer number (1277772111).

Almost surely, 2^2555544221 is an apocalyptic number.

It is an amenable number.

2555544221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555544221 is an equidigital number, since it uses as much as digits as its factorization.

2555544221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80000, while the sum is 35.

The square root of 2555544221 is about 50552.3908534502. The cubic root of 2555544221 is about 1367.1866219517.

Adding to 2555544221 its reverse (1224455552), we get a palindrome (3779999773).

The spelling of 2555544221 in words is "two billion, five hundred fifty-five million, five hundred forty-four thousand, two hundred twenty-one".