820589653243 has 2 divisors, whose sum is σ = 820589653244. Its totient is φ = 820589653242.

The previous prime is 820589653229. The next prime is 820589653249. The reversal of 820589653243 is 342356985028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820589653243 - 2³⁷ = 683150699771 is a prime.

It is not a weakly prime, because it can be changed into another prime (820589653249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410294826621 + 410294826622.

It is an arithmetic number, because the mean of its divisors is an integer number (410294826622).

Almost surely, 2^820589653243 is an apocalyptic number.

820589653243 is a deficient number, since it is larger than the sum of its proper divisors (1).

820589653243 is an equidigital number, since it uses as much as digits as its factorization.

820589653243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 820589653243 in words is "eight hundred twenty billion, five hundred eighty-nine million, six hundred fifty-three thousand, two hundred forty-three".