850997386649 has 2 divisors, whose sum is σ = 850997386650. Its totient is φ = 850997386648.

The previous prime is 850997386639. The next prime is 850997386721. The reversal of 850997386649 is 946683799058.

850997386649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733009945600 + 117987441049 = 856160^2 + 343493^2 .

It is a cyclic number.

It is not a de Polignac number, because 850997386649 - 2¹⁶ = 850997321113 is a prime.

It is not a weakly prime, because it can be changed into another prime (850997386619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425498693324 + 425498693325.

It is an arithmetic number, because the mean of its divisors is an integer number (425498693325).

Almost surely, 2^850997386649 is an apocalyptic number.

It is an amenable number.

850997386649 is a deficient number, since it is larger than the sum of its proper divisors (1).

850997386649 is an equidigital number, since it uses as much as digits as its factorization.

850997386649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705438720, while the sum is 74.

The spelling of 850997386649 in words is "eight hundred fifty billion, nine hundred ninety-seven million, three hundred eighty-six thousand, six hundred forty-nine".