850209396661 has 2 divisors, whose sum is σ = 850209396662. Its totient is φ = 850209396660.

The previous prime is 850209396611. The next prime is 850209396713. The reversal of 850209396661 is 166693902058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 834710640625 + 15498756036 = 913625^2 + 124494^2 .

It is a cyclic number.

It is not a de Polignac number, because 850209396661 - 2¹⁵ = 850209363893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850209396611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425104698330 + 425104698331.

It is an arithmetic number, because the mean of its divisors is an integer number (425104698331).

Almost surely, 2^850209396661 is an apocalyptic number.

It is an amenable number.

850209396661 is a deficient number, since it is larger than the sum of its proper divisors (1).

850209396661 is an equidigital number, since it uses as much as digits as its factorization.

850209396661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 850209396661 in words is "eight hundred fifty billion, two hundred nine million, three hundred ninety-six thousand, six hundred sixty-one".