42544245281 has 2 divisors, whose sum is σ = 42544245282. Its totient is φ = 42544245280.

The previous prime is 42544245199. The next prime is 42544245301. The reversal of 42544245281 is 18254244524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25542432400 + 17001812881 = 159820^2 + 130391^2 .

It is a cyclic number.

It is not a de Polignac number, because 42544245281 - 2¹⁸ = 42543983137 is a prime.

It is a super-2 number, since 2×42544245281² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42544275281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272122640 + 21272122641.

It is an arithmetic number, because the mean of its divisors is an integer number (21272122641).

Almost surely, 2^42544245281 is an apocalyptic number.

It is an amenable number.

42544245281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42544245281 is an equidigital number, since it uses as much as digits as its factorization.

42544245281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 409600, while the sum is 41.

The spelling of 42544245281 in words is "forty-two billion, five hundred forty-four million, two hundred forty-five thousand, two hundred eighty-one".