820879488553 has 2 divisors, whose sum is σ = 820879488554. Its totient is φ = 820879488552.

The previous prime is 820879488487. The next prime is 820879488587. The reversal of 820879488553 is 355884978028.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 811390195984 + 9489292569 = 900772^2 + 97413^2 .

It is a cyclic number.

It is not a de Polignac number, because 820879488553 - 2²⁵ = 820845934121 is a prime.

It is not a weakly prime, because it can be changed into another prime (820879483553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410439744276 + 410439744277.

It is an arithmetic number, because the mean of its divisors is an integer number (410439744277).

Almost surely, 2^820879488553 is an apocalyptic number.

It is an amenable number.

820879488553 is a deficient number, since it is larger than the sum of its proper divisors (1).

820879488553 is an equidigital number, since it uses as much as digits as its factorization.

820879488553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 154828800, while the sum is 67.

The spelling of 820879488553 in words is "eight hundred twenty billion, eight hundred seventy-nine million, four hundred eighty-eight thousand, five hundred fifty-three".