845771722406881 has 2 divisors, whose sum is σ = 845771722406882. Its totient is φ = 845771722406880.

The previous prime is 845771722406879. The next prime is 845771722406903. The reversal of 845771722406881 is 188604227177548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601358646438225 + 244413075968656 = 24522615^2 + 15633716^2 .

It is a cyclic number.

It is not a de Polignac number, because 845771722406881 - 2¹ = 845771722406879 is a prime.

It is a super-2 number, since 2×845771722406881² (a number of 31 digits) contains 22 as substring.

Together with 845771722406879, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 845771722406881.

It is not a weakly prime, because it can be changed into another prime (845771722406581) 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, 422885861203440 + 422885861203441.

It is an arithmetic number, because the mean of its divisors is an integer number (422885861203441).

Almost surely, 2^{845771722406881} is an apocalyptic number.

It is an amenable number.

845771722406881 is a deficient number, since it is larger than the sum of its proper divisors (1).

845771722406881 is an equidigital number, since it uses as much as digits as its factorization.

845771722406881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 337182720, while the sum is 70.

The spelling of 845771722406881 in words is "eight hundred forty-five trillion, seven hundred seventy-one billion, seven hundred twenty-two million, four hundred six thousand, eight hundred eighty-one".