820808868023 has 2 divisors, whose sum is σ = 820808868024. Its totient is φ = 820808868022.

The previous prime is 820808867999. The next prime is 820808868071. The reversal of 820808868023 is 320868808028.

820808868023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 820808868023 - 2¹⁶ = 820808802487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820808868073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410404434011 + 410404434012.

It is an arithmetic number, because the mean of its divisors is an integer number (410404434012).

Almost surely, 2^820808868023 is an apocalyptic number.

820808868023 is a deficient number, since it is larger than the sum of its proper divisors (1).

820808868023 is an equidigital number, since it uses as much as digits as its factorization.

820808868023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2359296, while the sum is 53.

The spelling of 820808868023 in words is "eight hundred twenty billion, eight hundred eight million, eight hundred sixty-eight thousand, twenty-three".