42442244857 has 2 divisors, whose sum is σ = 42442244858. Its totient is φ = 42442244856.

The previous prime is 42442244851. The next prime is 42442244899. The reversal of 42442244857 is 75844224424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30532669696 + 11909575161 = 174736^2 + 109131^2 .

It is a cyclic number.

It is not a de Polignac number, because 42442244857 - 2¹⁹ = 42441720569 is a prime.

It is not a weakly prime, because it can be changed into another prime (42442244851) 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 as a sum of consecutive naturals, namely, 21221122428 + 21221122429.

It is an arithmetic number, because the mean of its divisors is an integer number (21221122429).

Almost surely, 2^42442244857 is an apocalyptic number.

It is an amenable number.

42442244857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42442244857 is an equidigital number, since it uses as much as digits as its factorization.

42442244857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2293760, while the sum is 46.

The spelling of 42442244857 in words is "forty-two billion, four hundred forty-two million, two hundred forty-four thousand, eight hundred fifty-seven".