816528213841 has 2 divisors, whose sum is σ = 816528213842. Its totient is φ = 816528213840.

The previous prime is 816528213833. The next prime is 816528213859. The reversal of 816528213841 is 148312825618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775104160000 + 41424053841 = 880400^2 + 203529^2 .

It is a cyclic number.

It is not a de Polignac number, because 816528213841 - 2³ = 816528213833 is a prime.

It is not a weakly prime, because it can be changed into another prime (816528213871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408264106920 + 408264106921.

It is an arithmetic number, because the mean of its divisors is an integer number (408264106921).

Almost surely, 2^816528213841 is an apocalyptic number.

It is an amenable number.

816528213841 is a deficient number, since it is larger than the sum of its proper divisors (1).

816528213841 is an equidigital number, since it uses as much as digits as its factorization.

816528213841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 49.

The spelling of 816528213841 in words is "eight hundred sixteen billion, five hundred twenty-eight million, two hundred thirteen thousand, eight hundred forty-one".