442220817781 has 2 divisors, whose sum is σ = 442220817782. Its totient is φ = 442220817780.

The previous prime is 442220817763. The next prime is 442220817869. The reversal of 442220817781 is 187718022244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296169966225 + 146050851556 = 544215^2 + 382166^2 .

It is a cyclic number.

It is not a de Polignac number, because 442220817781 - 2⁷ = 442220817653 is a prime.

It is a super-3 number, since 3×442220817781³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442220817721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221110408890 + 221110408891.

It is an arithmetic number, because the mean of its divisors is an integer number (221110408891).

Almost surely, 2^442220817781 is an apocalyptic number.

It is an amenable number.

442220817781 is a deficient number, since it is larger than the sum of its proper divisors (1).

442220817781 is an equidigital number, since it uses as much as digits as its factorization.

442220817781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 401408, while the sum is 46.

The spelling of 442220817781 in words is "four hundred forty-two billion, two hundred twenty million, eight hundred seventeen thousand, seven hundred eighty-one".