810778600097 has 2 divisors, whose sum is σ = 810778600098. Its totient is φ = 810778600096.

The previous prime is 810778600061. The next prime is 810778600187. The reversal of 810778600097 is 790006877018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517235694481 + 293542905616 = 719191^2 + 541796^2 .

It is a cyclic number.

It is not a de Polignac number, because 810778600097 - 2⁶ = 810778600033 is a prime.

It is not a weakly prime, because it can be changed into another prime (810778600057) 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, 405389300048 + 405389300049.

It is an arithmetic number, because the mean of its divisors is an integer number (405389300049).

Almost surely, 2^810778600097 is an apocalyptic number.

It is an amenable number.

810778600097 is a deficient number, since it is larger than the sum of its proper divisors (1).

810778600097 is an equidigital number, since it uses as much as digits as its factorization.

810778600097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 810778600097 in words is "eight hundred ten billion, seven hundred seventy-eight million, six hundred thousand, ninety-seven".