2544522221261 has 2 divisors, whose sum is σ = 2544522221262. Its totient is φ = 2544522221260.

The previous prime is 2544522221251. The next prime is 2544522221273. The reversal of 2544522221261 is 1621222254452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2520175300036 + 24346921225 = 1587506^2 + 156035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2544522221261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2544522221201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272261110630 + 1272261110631.

It is an arithmetic number, because the mean of its divisors is an integer number (1272261110631).

Almost surely, 2^{2544522221261} is an apocalyptic number.

It is an amenable number.

2544522221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2544522221261 is an equidigital number, since it uses as much as digits as its factorization.

2544522221261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153600, while the sum is 38.

The spelling of 2544522221261 in words is "two trillion, five hundred forty-four billion, five hundred twenty-two million, two hundred twenty-one thousand, two hundred sixty-one".