810128319897641 has 2 divisors, whose sum is σ = 810128319897642. Its totient is φ = 810128319897640.

The previous prime is 810128319897599. The next prime is 810128319897859. The reversal of 810128319897641 is 146798913821018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804764927087641 + 5363392810000 = 28368379^2 + 2315900^2 .

It is a cyclic number.

It is not a de Polignac number, because 810128319897641 - 2¹⁸ = 810128319635497 is a prime.

It is not a weakly prime, because it can be changed into another prime (810128319897041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405064159948820 + 405064159948821.

It is an arithmetic number, because the mean of its divisors is an integer number (405064159948821).

Almost surely, 2^{810128319897641} is an apocalyptic number.

It is an amenable number.

810128319897641 is a deficient number, since it is larger than the sum of its proper divisors (1).

810128319897641 is an equidigital number, since it uses as much as digits as its factorization.

810128319897641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41803776, while the sum is 68.

The spelling of 810128319897641 in words is "eight hundred ten trillion, one hundred twenty-eight billion, three hundred nineteen million, eight hundred ninety-seven thousand, six hundred forty-one".