820856846883559 has 2 divisors, whose sum is σ = 820856846883560. Its totient is φ = 820856846883558.

The previous prime is 820856846883499. The next prime is 820856846883631. The reversal of 820856846883559 is 955388648658028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820856846883559 - 2⁴⁹ = 257906893462247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820856846883859) 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, 410428423441779 + 410428423441780.

It is an arithmetic number, because the mean of its divisors is an integer number (410428423441780).

Almost surely, 2^{820856846883559} is an apocalyptic number.

820856846883559 is a deficient number, since it is larger than the sum of its proper divisors (1).

820856846883559 is an equidigital number, since it uses as much as digits as its factorization.

820856846883559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31850496000, while the sum is 85.

The spelling of 820856846883559 in words is "eight hundred twenty trillion, eight hundred fifty-six billion, eight hundred forty-six million, eight hundred eighty-three thousand, five hundred fifty-nine".