851166063649 has 16 divisors (see below), whose sum is σ = 933435207936. Its totient is φ = 769713481600.

The previous prime is 851166063641. The next prime is 851166063653. The reversal of 851166063649 is 946360661158.

It is a cyclic number.

It is not a de Polignac number, because 851166063649 - 2³ = 851166063641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 851166063649.

It is not an unprimeable number, because it can be changed into a prime (851166063641) 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 in 15 ways as a sum of consecutive naturals, for example, 12341349 + ... + 12410125.

It is an arithmetic number, because the mean of its divisors is an integer number (58339700496).

Almost surely, 2^851166063649 is an apocalyptic number.

It is an amenable number.

851166063649 is a deficient number, since it is larger than the sum of its proper divisors (82269144287).

851166063649 is a wasteful number, since it uses less digits than its factorization.

851166063649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74696.

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 851166063649 in words is "eight hundred fifty-one billion, one hundred sixty-six million, sixty-three thousand, six hundred forty-nine".