850666799761 has 2 divisors, whose sum is σ = 850666799762. Its totient is φ = 850666799760.

The previous prime is 850666799711. The next prime is 850666799777. The reversal of 850666799761 is 167997666058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767584502161 + 83082297600 = 876119^2 + 288240^2 .

It is a cyclic number.

It is not a de Polignac number, because 850666799761 - 2²¹ = 850664702609 is a prime.

It is not a weakly prime, because it can be changed into another prime (850666799711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425333399880 + 425333399881.

It is an arithmetic number, because the mean of its divisors is an integer number (425333399881).

Almost surely, 2^850666799761 is an apocalyptic number.

It is an amenable number.

850666799761 is a deficient number, since it is larger than the sum of its proper divisors (1).

850666799761 is an equidigital number, since it uses as much as digits as its factorization.

850666799761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 205752960, while the sum is 70.

The spelling of 850666799761 in words is "eight hundred fifty billion, six hundred sixty-six million, seven hundred ninety-nine thousand, seven hundred sixty-one".