872821643801 has 2 divisors, whose sum is σ = 872821643802. Its totient is φ = 872821643800.

The previous prime is 872821643779. The next prime is 872821643833. The reversal of 872821643801 is 108346128278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517391051401 + 355430592400 = 719299^2 + 596180^2 .

It is a cyclic number.

It is not a de Polignac number, because 872821643801 - 2¹⁴ = 872821627417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 872821643801.

It is not a weakly prime, because it can be changed into another prime (872821643891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436410821900 + 436410821901.

It is an arithmetic number, because the mean of its divisors is an integer number (436410821901).

Almost surely, 2^872821643801 is an apocalyptic number.

It is an amenable number.

872821643801 is a deficient number, since it is larger than the sum of its proper divisors (1).

872821643801 is an equidigital number, since it uses as much as digits as its factorization.

872821643801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 872821643801 in words is "eight hundred seventy-two billion, eight hundred twenty-one million, six hundred forty-three thousand, eight hundred one".