820066469 has 2 divisors, whose sum is σ = 820066470. Its totient is φ = 820066468.

The previous prime is 820066441. The next prime is 820066549. The reversal of 820066469 is 964660028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686964100 + 133102369 = 26210^2 + 11537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820066469 is a prime.

It is a super-2 number, since 2×820066469² = 1345018027156255922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820066439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410033234 + 410033235.

It is an arithmetic number, because the mean of its divisors is an integer number (410033235).

Almost surely, 2^820066469 is an apocalyptic number.

It is an amenable number.

820066469 is a deficient number, since it is larger than the sum of its proper divisors (1).

820066469 is an equidigital number, since it uses as much as digits as its factorization.

820066469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 820066469 is about 28636.8027021174. The cubic root of 820066469 is about 936.0154520089.

The spelling of 820066469 in words is "eight hundred twenty million, sixty-six thousand, four hundred sixty-nine".