85765222321 has 2 divisors, whose sum is σ = 85765222322. Its totient is φ = 85765222320.

The previous prime is 85765222313. The next prime is 85765222351. The reversal of 85765222321 is 12322256758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85212031921 + 553190400 = 291911^2 + 23520^2 .

It is a cyclic number.

It is not a de Polignac number, because 85765222321 - 2³ = 85765222313 is a prime.

It is not a weakly prime, because it can be changed into another prime (85765222351) 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, 42882611160 + 42882611161.

It is an arithmetic number, because the mean of its divisors is an integer number (42882611161).

Almost surely, 2^85765222321 is an apocalyptic number.

It is an amenable number.

85765222321 is a deficient number, since it is larger than the sum of its proper divisors (1).

85765222321 is an equidigital number, since it uses as much as digits as its factorization.

85765222321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 43.

The spelling of 85765222321 in words is "eighty-five billion, seven hundred sixty-five million, two hundred twenty-two thousand, three hundred twenty-one".