845771221128973 has 2 divisors, whose sum is σ = 845771221128974. Its totient is φ = 845771221128972.

The previous prime is 845771221128923. The next prime is 845771221128989. The reversal of 845771221128973 is 379821122177548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 596078699166729 + 249692521962244 = 24414723^2 + 15801662^2 .

It is a cyclic number.

It is not a de Polignac number, because 845771221128973 - 2⁹ = 845771221128461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 845771221128899 and 845771221128908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845771221128913) 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, 422885610564486 + 422885610564487.

It is an arithmetic number, because the mean of its divisors is an integer number (422885610564487).

Almost surely, 2^{845771221128973} is an apocalyptic number.

It is an amenable number.

845771221128973 is a deficient number, since it is larger than the sum of its proper divisors (1).

845771221128973 is an equidigital number, since it uses as much as digits as its factorization.

845771221128973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94832640, while the sum is 67.

The spelling of 845771221128973 in words is "eight hundred forty-five trillion, seven hundred seventy-one billion, two hundred twenty-one million, one hundred twenty-eight thousand, nine hundred seventy-three".