872821643833 has 2 divisors, whose sum is σ = 872821643834. Its totient is φ = 872821643832.

The previous prime is 872821643801. The next prime is 872821643843. The reversal of 872821643833 is 338346128278.

It is a happy number.

872821643833 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853264180729 + 19557463104 = 923723^2 + 139848^2 .

It is a cyclic number.

It is not a de Polignac number, because 872821643833 - 2⁵ = 872821643801 is a prime.

It is not a weakly prime, because it can be changed into another prime (872821643843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436410821916 + 436410821917.

It is an arithmetic number, because the mean of its divisors is an integer number (436410821917).

Almost surely, 2^872821643833 is an apocalyptic number.

It is an amenable number.

872821643833 is a deficient number, since it is larger than the sum of its proper divisors (1).

872821643833 is an equidigital number, since it uses as much as digits as its factorization.

872821643833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 55.

The spelling of 872821643833 in words is "eight hundred seventy-two billion, eight hundred twenty-one million, six hundred forty-three thousand, eight hundred thirty-three".