822856081669 has 2 divisors, whose sum is σ = 822856081670. Its totient is φ = 822856081668.

The previous prime is 822856081661. The next prime is 822856081673. The reversal of 822856081669 is 966180658228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768339902500 + 54516179169 = 876550^2 + 233487^2 .

It is a cyclic number.

It is not a de Polignac number, because 822856081669 - 2³ = 822856081661 is a prime.

It is a super-2 number, since 2×822856081669² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (822856081661) 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, 411428040834 + 411428040835.

It is an arithmetic number, because the mean of its divisors is an integer number (411428040835).

Almost surely, 2^822856081669 is an apocalyptic number.

It is an amenable number.

822856081669 is a deficient number, since it is larger than the sum of its proper divisors (1).

822856081669 is an equidigital number, since it uses as much as digits as its factorization.

822856081669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19906560, while the sum is 61.

The spelling of 822856081669 in words is "eight hundred twenty-two billion, eight hundred fifty-six million, eighty-one thousand, six hundred sixty-nine".